updated git hook to check composer installation
updated git hook to check composer installation

philippfrenzel/app,Silver90/app,philippfrenzel/app,myorb/bookapp,janatzend/app,Silver90/app,phundament/app,myorb/pmyapp,myorb/bookapp,janatzend/app,myorb/pmyapp,phundament/app,myorb/m2-parser-system,phundament/app,myorb/pmyapp,cornernote/app,myorb/pmyapp,motin/giic-gtc-hybrid-template-demo,myorb/bookapp,motin/giic-gtc-hybrid-template-demo,cornernote/app,myorb/m2-parser-system,janatzend/app,Silver90/app,cornernote/app,philippfrenzel/app,myorb/m2-parser-system,myorb/m2-parser-system,cornernote/app,davidfang/app,davidfang/app,davidfang/app