fix gemspec for ruby 1.9
fix gemspec for ruby 1.9

varyonic/activeadmin,activeadmin/activeadmin,cmunozgar/activeadmin,wspurgin/activeadmin,davydovanton/activeadmin,jethroo/activeadmin,chdem/activeadmin,mauriciopasquier/active_admin,siutin/activeadmin,samvincent/active_admin,bcavileer/activeadmin,bcavileer/activeadmin,lampo/activeadmin,SoftSwiss/active_admin,h2ocube/active_admin,hobbes37/activeadmin,mateusg/active_admin,waymondo/active_admin,mynksngh/activeadmin,adibsaad/activeadmin,westonplatter/activeadmin,FundingGates/activeadmin,dhartoto/activeadmin,sanyaade-iot/activeadmin,gogovan/activeadmin,quikly/active_admin,buren/activeadmin,Skulli/activeadmin,activeadmin/activeadmin,samvincent/active_admin,activeadmin/activeadmin,halilim/activeadmin,iuriandreazza/activeadmin,getkiwicom/activeadmin,bolshakov/activeadmin,siutin/activeadmin,wspurgin/activeadmin,javierjulio/activeadmin,FundingGates/activeadmin,Some1Else/activeadmin,cmunozgar/activeadmin,chrisseldo/activeadmin,mediebruket/activeadmin,tjgrathwell/activeadmin,maysam/activeadmin,senid231/activeadmin,jethroo/activeadmin,jclay/active_admin,cmunozgar/activeadmin,dannyshafer/activeadmin,hiroponz/activeadmin,seanski/activeadmin,deivid-rodriguez/activeadmin,krautcomputing/activeadmin,vytenis-s/activeadmin,deivid-rodriguez/activeadmin,yeti-switch/active_admin,mohitnatoo/activeadmin,davydovanton/activeadmin,jclay/active_admin,timoschilling/activeadmin,lampo/activeadmin,halilim/activeadmin,sharma1nitish/activeadmin,scarver2/activeadmin,hyperoslo/activeadmin,iguchi1124/activeadmin,yijiasu/activeadmin,mwlang/active_admin,yeti-switch/active_admin,ampinog/activeadmin,zfben/activeadmin,totzyuta/activeadmin,hobbes37/activeadmin,wspurgin/activeadmin,temochka-test/activeadmin,siutin/activeadmin,Ibotta/activeadmin,sharma1nitish/activeadmin,danielevans/activeadmin,dhartoto/activeadmin,shishir127/activeadmin,h2ocube/active_admin,tf/activeadmin,alonerage/activeadmin,saiqulhaq/activeadmin,dannyshafer/activeadmin,thomascarterx/activeadmin,Davidzhu001/activeadmin,MohamedHegab/activeadmin,hyperoslo/activeadmin,strivedi183/activeadmin,dhartoto/activeadmin,alonerage/activeadmin,mrjman/activeadmin,vraravam/activeadmin,thomascarterx/activeadmin,sharma1nitish/activeadmin,artofhuman/activeadmin,varyonic/activeadmin,applexiaohao/activeadmin,danielevans/activeadmin,saveav/activeadmin,ishumilova/activeadmin,samvincent/active_admin,gogovan/activeadmin,bolshakov/activeadmin,mohitnatoo/activeadmin,yijiasu/activeadmin,Pollywog23/activeadmin,senid231/activeadmin,dalegregory/activeadmin,ampinog/activeadmin,sanyaade-iot/activeadmin,iguchi1124/activeadmin,krautcomputing/activeadmin,mynksngh/activeadmin,seanski/activeadmin,Amandeepsinghghai/activeadmin,dalegregory/activeadmin,chdem/activeadmin,saveav/activeadmin,SoftSwiss/active_admin,beyondthestory/activeadmin,yijiasu/activeadmin,iuriandreazza/activeadmin,timoschilling/activeadmin,shishir127/activeadmin,yeti-switch/active_admin,jethroo/activeadmin,waymondo/active_admin,keichan34/active_admin,waymondo/active_admin,vraravam/activeadmin,getkiwicom/activeadmin,totzyuta/activeadmin,Ryohu/activeadmin,mediebruket/activeadmin,Ryohu/activeadmin,bloomrain/activeadmin,hobbes37/activeadmin,FundingGates/activeadmin,applexiaohao/activeadmin,temochka-test/activeadmin,presskey/activeadmin,timoschilling/activeadmin,vytenis-s/activeadmin,iuriandreazza/activeadmin,strivedi183/activeadmin,chrisseldo/activeadmin,Skulli/activeadmin,bloomrain/activeadmin,westonplatter/activeadmin,Ibotta/activeadmin,beyondthestory/activeadmin,presskey/activeadmin,vytenis-s/activeadmin,whatcould/active_admin,Amandeepsinghghai/activeadmin,Davidzhu001/activeadmin,varyonic/activeadmin,rubixware/activeadmin,iuriandreazza/activeadmin,rtrepo/activeadmin,Ibotta/activeadmin,mynksngh/activeadmin,JeffreyATW/activeadmin,scarver2/activeadmin,javierjulio/activeadmin,iuriandreazza/activeadmin,Pollywog23/activeadmin,maysam/activeadmin,Andrekra/activeadmin,shishir127/activeadmin,mauriciopasquier/active_admin,rubixware/activeadmin,tjgrathwell/activeadmin,senid231/activeadmin,totzyuta/activeadmin,mateusg/active_admin,Andrekra/activeadmin,vraravam/activeadmin,SoftSwiss/active_admin,hiroponz/activeadmin,scarver2/activeadmin,keichan34/active_admin,iuriandreazza/activeadmin,zfben/activeadmin,thomascarterx/activeadmin,deivid-rodriguez/activeadmin,dalegregory/activeadmin,whatcould/active_admin,iuriandreazza/activeadmin,whatcould/active_admin,presskey/activeadmin,davydovanton/activeadmin,Ryohu/activeadmin,mateusg/active_admin,hyperoslo/activeadmin,adibsaad/activeadmin,bcavileer/activeadmin,mrjman/activeadmin,Davidzhu001/activeadmin,chdem/activeadmin,quikly/active_admin,iguchi1124/activeadmin,JeffreyATW/activeadmin,strivedi183/activeadmin,dannyshafer/activeadmin,bloomrain/activeadmin,saveav/activeadmin,buren/activeadmin,rubixware/activeadmin,hiroponz/activeadmin,bolshakov/activeadmin,maysam/activeadmin,beyondthestory/activeadmin,artofhuman/activeadmin,Amandeepsinghghai/activeadmin,mwlang/active_admin,JeffreyATW/activeadmin,krautcomputing/activeadmin,zfben/activeadmin,ishumilova/activeadmin,mauriciopasquier/active_admin,gogovan/activeadmin,mediebruket/activeadmin,rtrepo/activeadmin,ishumilova/activeadmin,chrisseldo/activeadmin,MohamedHegab/activeadmin,danielevans/activeadmin,artofhuman/activeadmin,temochka-test/activeadmin,mohitnatoo/activeadmin,javierjulio/activeadmin,keichan34/active_admin,mwlang/active_admin,alonerage/activeadmin,seanski/activeadmin,jclay/active_admin,rtrepo/activeadmin,buren/activeadmin,getkiwicom/activeadmin,Some1Else/activeadmin,saiqulhaq/activeadmin,halilim/activeadmin,tjgrathwell/activeadmin,quikly/active_admin,Pollywog23/activeadmin,saiqulhaq/activeadmin,MohamedHegab/activeadmin,ampinog/activeadmin,lampo/activeadmin,sanyaade-iot/activeadmin,Some1Else/activeadmin,Andrekra/activeadmin,Skulli/activeadmin,tf/activeadmin,westonplatter/activeadmin,adibsaad/activeadmin,mrjman/activeadmin,tf/activeadmin,applexiaohao/activeadmin,h2ocube/active_admin