Fixing is_a check for Channel
Fixing is_a check for Channel

php ```is_a``` function expects fully qualified class name to validate.
msmania/grpc,vjpai/grpc,ejona86/grpc,sreecha/grpc,ctiller/grpc,stanley-cheung/grpc,adelez/grpc,zhimingxie/grpc,baylabs/grpc,kumaralokgithub/grpc,MakMukhi/grpc,makdharma/grpc,yongni/grpc,daniel-j-born/grpc,baylabs/grpc,Crevil/grpc,stanley-cheung/grpc,jtattermusch/grpc,makdharma/grpc,vjpai/grpc,firebase/grpc,7anner/grpc,quizlet/grpc,sreecha/grpc,chrisdunelm/grpc,yongni/grpc,msmania/grpc,donnadionne/grpc,carl-mastrangelo/grpc,sreecha/grpc,yang-g/grpc,Vizerai/grpc,kpayson64/grpc,muxi/grpc,fuchsia-mirror/third_party-grpc,carl-mastrangelo/grpc,mehrdada/grpc,thinkerou/grpc,nicolasnoble/grpc,msmania/grpc,kpayson64/grpc,ncteisen/grpc,jboeuf/grpc,grpc/grpc,grpc/grpc,grpc/grpc,yongni/grpc,thinkerou/grpc,quizlet/grpc,stanley-cheung/grpc,simonkuang/grpc,vjpai/grpc,chrisdunelm/grpc,mehrdada/grpc,quizlet/grpc,geffzhang/grpc,adelez/grpc,donnadionne/grpc,geffzhang/grpc,quizlet/grpc,firebase/grpc,ejona86/grpc,7anner/grpc,vjpai/grpc,pszemus/grpc,yongni/grpc,7anner/grpc,thinkerou/grpc,deepaklukose/grpc,jboeuf/grpc,carl-mastrangelo/grpc,baylabs/grpc,thinkerou/grpc,thinkerou/grpc,ejona86/grpc,Crevil/grpc,matt-kwong/grpc,zhimingxie/grpc,kumaralokgithub/grpc,kpayson64/grpc,daniel-j-born/grpc,thinkerou/grpc,MakMukhi/grpc,ctiller/grpc,ctiller/grpc,donnadionne/grpc,Crevil/grpc,Vizerai/grpc,ejona86/grpc,sreecha/grpc,firebase/grpc,yang-g/grpc,fuchsia-mirror/third_party-grpc,jtattermusch/grpc,grpc/grpc,mehrdada/grpc,ctiller/grpc,kskalski/grpc,PeterFaiman/ruby-grpc-minimal,adelez/grpc,yang-g/grpc,ejona86/grpc,vjpai/grpc,pszemus/grpc,dgquintas/grpc,simonkuang/grpc,vjpai/grpc,Crevil/grpc,vjpai/grpc,kriswuollett/grpc,Vizerai/grpc,Crevil/grpc,yang-g/grpc,geffzhang/grpc,simonkuang/grpc,baylabs/grpc,pszemus/grpc,Vizerai/grpc,pszemus/grpc,daniel-j-born/grpc,deepaklukose/grpc,sreecha/grpc,daniel-j-born/grpc,vsco/grpc,geffzhang/grpc,pszemus/grpc,grpc/grpc,ctiller/grpc,kpayson64/grpc,yongni/grpc,murgatroid99/grpc,vjpai/grpc,simonkuang/grpc,sreecha/grpc,dgquintas/grpc,makdharma/grpc,vsco/grpc,fuchsia-mirror/third_party-grpc,ipylypiv/grpc,ncteisen/grpc,chrisdunelm/grpc,mehrdada/grpc,grpc/grpc,kskalski/grpc,ncteisen/grpc,muxi/grpc,grpc/grpc,quizlet/grpc,makdharma/grpc,matt-kwong/grpc,jtattermusch/grpc,vsco/grpc,yang-g/grpc,jtattermusch/grpc,yongni/grpc,jboeuf/grpc,yongni/grpc,yang-g/grpc,Vizerai/grpc,jboeuf/grpc,ejona86/grpc,kpayson64/grpc,ipylypiv/grpc,deepaklukose/grpc,dgquintas/grpc,adelez/grpc,thinkerou/grpc,daniel-j-born/grpc,donnadionne/grpc,jboeuf/grpc,carl-mastrangelo/grpc,Vizerai/grpc,makdharma/grpc,daniel-j-born/grpc,ejona86/grpc,mehrdada/grpc,murgatroid99/grpc,muxi/grpc,deepaklukose/grpc,simonkuang/grpc,vsco/grpc,adelez/grpc,carl-mastrangelo/grpc,MakMukhi/grpc,muxi/grpc,kumaralokgithub/grpc,fuchsia-mirror/third_party-grpc,ejona86/grpc,murgatroid99/grpc,kriswuollett/grpc,stanley-cheung/grpc,ipylypiv/grpc,stanley-cheung/grpc,donnadionne/grpc,jtattermusch/grpc,philcleveland/grpc,nicolasnoble/grpc,philcleveland/grpc,ejona86/grpc,PeterFaiman/ruby-grpc-minimal,ctiller/grpc,ncteisen/grpc,MakMukhi/grpc,geffzhang/grpc,vsco/grpc,pszemus/grpc,kriswuollett/grpc,muxi/grpc,carl-mastrangelo/grpc,adelez/grpc,chrisdunelm/grpc,firebase/grpc,ncteisen/grpc,quizlet/grpc,vjpai/grpc,matt-kwong/grpc,pszemus/grpc,7anner/grpc,philcleveland/grpc,nicolasnoble/grpc,PeterFaiman/ruby-grpc-minimal,simonkuang/grpc,carl-mastrangelo/grpc,makdharma/grpc,mehrdada/grpc,jboeuf/grpc,dgquintas/grpc,dgquintas/grpc,chrisdunelm/grpc,nicolasnoble/grpc,ctiller/grpc,thinkerou/grpc,ctiller/grpc,PeterFaiman/ruby-grpc-minimal,baylabs/grpc,ejona86/grpc,jtattermusch/grpc,chrisdunelm/grpc,jtattermusch/grpc,deepaklukose/grpc,ctiller/grpc,jtattermusch/grpc,chrisdunelm/grpc,philcleveland/grpc,msmania/grpc,kumaralokgithub/grpc,MakMukhi/grpc,adelez/grpc,7anner/grpc,carl-mastrangelo/grpc,philcleveland/grpc,ncteisen/grpc,matt-kwong/grpc,MakMukhi/grpc,kpayson64/grpc,stanley-cheung/grpc,grpc/grpc,grpc/grpc,Vizerai/grpc,kriswuollett/grpc,ipylypiv/grpc,muxi/grpc,Vizerai/grpc,sreecha/grpc,deepaklukose/grpc,fuchsia-mirror/third_party-grpc,carl-mastrangelo/grpc,jboeuf/grpc,vjpai/grpc,nicolasnoble/grpc,thinkerou/grpc,msmania/grpc,kumaralokgithub/grpc,kskalski/grpc,donnadionne/grpc,pszemus/grpc,ncteisen/grpc,daniel-j-born/grpc,Crevil/grpc,stanley-cheung/grpc,dgquintas/grpc,geffzhang/grpc,kriswuollett/grpc,mehrdada/grpc,PeterFaiman/ruby-grpc-minimal,grpc/grpc,fuchsia-mirror/third_party-grpc,baylabs/grpc,7anner/grpc,dgquintas/grpc,PeterFaiman/ruby-grpc-minimal,philcleveland/grpc,jboeuf/grpc,kskalski/grpc,kskalski/grpc,zhimingxie/grpc,simonkuang/grpc,kumaralokgithub/grpc,fuchsia-mirror/third_party-grpc,ejona86/grpc,MakMukhi/grpc,Crevil/grpc,7anner/grpc,firebase/grpc,mehrdada/grpc,donnadionne/grpc,ipylypiv/grpc,sreecha/grpc,kpayson64/grpc,jtattermusch/grpc,daniel-j-born/grpc,philcleveland/grpc,quizlet/grpc,mehrdada/grpc,nicolasnoble/grpc,Vizerai/grpc,PeterFaiman/ruby-grpc-minimal,MakMukhi/grpc,firebase/grpc,baylabs/grpc,geffzhang/grpc,deepaklukose/grpc,jboeuf/grpc,firebase/grpc,zhimingxie/grpc,vsco/grpc,vjpai/grpc,fuchsia-mirror/third_party-grpc,thinkerou/grpc,geffzhang/grpc,chrisdunelm/grpc,murgatroid99/grpc,stanley-cheung/grpc,ipylypiv/grpc,mehrdada/grpc,murgatroid99/grpc,deepaklukose/grpc,vjpai/grpc,jtattermusch/grpc,kpayson64/grpc,mehrdada/grpc,nicolasnoble/grpc,ncteisen/grpc,baylabs/grpc,kskalski/grpc,thinkerou/grpc,quizlet/grpc,PeterFaiman/ruby-grpc-minimal,ctiller/grpc,pszemus/grpc,zhimingxie/grpc,stanley-cheung/grpc,Crevil/grpc,ctiller/grpc,zhimingxie/grpc,ctiller/grpc,zhimingxie/grpc,msmania/grpc,nicolasnoble/grpc,murgatroid99/grpc,murgatroid99/grpc,yongni/grpc,kumaralokgithub/grpc,matt-kwong/grpc,matt-kwong/grpc,jtattermusch/grpc,matt-kwong/grpc,msmania/grpc,PeterFaiman/ruby-grpc-minimal,makdharma/grpc,daniel-j-born/grpc,grpc/grpc,MakMukhi/grpc,grpc/grpc,makdharma/grpc,muxi/grpc,firebase/grpc,dgquintas/grpc,yang-g/grpc,pszemus/grpc,quizlet/grpc,jboeuf/grpc,matt-kwong/grpc,ncteisen/grpc,mehrdada/grpc,ncteisen/grpc,simonkuang/grpc,baylabs/grpc,yang-g/grpc,vsco/grpc,stanley-cheung/grpc,ipylypiv/grpc,kumaralokgithub/grpc,ipylypiv/grpc,sreecha/grpc,murgatroid99/grpc,adelez/grpc,donnadionne/grpc,nicolasnoble/grpc,donnadionne/grpc,zhimingxie/grpc,philcleveland/grpc,pszemus/grpc,murgatroid99/grpc,carl-mastrangelo/grpc,jboeuf/grpc,muxi/grpc,sreecha/grpc,simonkuang/grpc,murgatroid99/grpc,yang-g/grpc,sreecha/grpc,msmania/grpc,geffzhang/grpc,chrisdunelm/grpc,kriswuollett/grpc,Vizerai/grpc,pszemus/grpc,donnadionne/grpc,muxi/grpc,muxi/grpc,vsco/grpc,zhimingxie/grpc,deepaklukose/grpc,kriswuollett/grpc,kumaralokgithub/grpc,fuchsia-mirror/third_party-grpc,fuchsia-mirror/third_party-grpc,ipylypiv/grpc,ncteisen/grpc,firebase/grpc,matt-kwong/grpc,donnadionne/grpc,thinkerou/grpc,nicolasnoble/grpc,kskalski/grpc,stanley-cheung/grpc,kpayson64/grpc,carl-mastrangelo/grpc,Crevil/grpc,firebase/grpc,ncteisen/grpc,stanley-cheung/grpc,donnadionne/grpc,kskalski/grpc,7anner/grpc,sreecha/grpc,nicolasnoble/grpc,makdharma/grpc,dgquintas/grpc,kriswuollett/grpc,chrisdunelm/grpc,7anner/grpc,jtattermusch/grpc,kskalski/grpc,kriswuollett/grpc,kpayson64/grpc,philcleveland/grpc,firebase/grpc,dgquintas/grpc,adelez/grpc,kpayson64/grpc,carl-mastrangelo/grpc,PeterFaiman/ruby-grpc-minimal,muxi/grpc,dgquintas/grpc,yongni/grpc,ejona86/grpc,nicolasnoble/grpc,msmania/grpc,chrisdunelm/grpc,vsco/grpc,firebase/grpc,jboeuf/grpc,Vizerai/grpc,muxi/grpc