remove rails 4.2 section from readme
remove rails 4.2 section from readme

it's no longer needed since inherited_resources 1.6 is released
shishir127/activeadmin,varyonic/activeadmin,jethroo/activeadmin,chdem/activeadmin,hiroponz/activeadmin,shishir127/activeadmin,iguchi1124/activeadmin,maysam/activeadmin,rtrepo/activeadmin,siutin/activeadmin,rubixware/activeadmin,keichan34/active_admin,totzyuta/activeadmin,h2ocube/active_admin,davydovanton/activeadmin,jclay/active_admin,presskey/activeadmin,artofhuman/activeadmin,deivid-rodriguez/activeadmin,ampinog/activeadmin,iuriandreazza/activeadmin,dalegregory/activeadmin,seanski/activeadmin,iuriandreazza/activeadmin,westonplatter/activeadmin,dhartoto/activeadmin,vraravam/activeadmin,scarver2/activeadmin,senid231/activeadmin,wspurgin/activeadmin,jethroo/activeadmin,beyondthestory/activeadmin,thomascarterx/activeadmin,rubixware/activeadmin,Pollywog23/activeadmin,ampinog/activeadmin,timoschilling/activeadmin,chdem/activeadmin,iuriandreazza/activeadmin,Davidzhu001/activeadmin,yijiasu/activeadmin,Pollywog23/activeadmin,bolshakov/activeadmin,h2ocube/active_admin,activeadmin/activeadmin,JeffreyATW/activeadmin,totzyuta/activeadmin,siutin/activeadmin,mrjman/activeadmin,tf/activeadmin,krautcomputing/activeadmin,Davidzhu001/activeadmin,yeti-switch/active_admin,hiroponz/activeadmin,samvincent/active_admin,iguchi1124/activeadmin,vraravam/activeadmin,lampo/activeadmin,rubixware/activeadmin,MohamedHegab/activeadmin,ampinog/activeadmin,gogovan/activeadmin,yeti-switch/active_admin,yijiasu/activeadmin,vytenis-s/activeadmin,rtrepo/activeadmin,samvincent/active_admin,mohitnatoo/activeadmin,Ryohu/activeadmin,krautcomputing/activeadmin,dannyshafer/activeadmin,bloomrain/activeadmin,FundingGates/activeadmin,getkiwicom/activeadmin,Ibotta/activeadmin,sanyaade-iot/activeadmin,dhartoto/activeadmin,presskey/activeadmin,sharma1nitish/activeadmin,SoftSwiss/active_admin,getkiwicom/activeadmin,mauriciopasquier/active_admin,senid231/activeadmin,MohamedHegab/activeadmin,saiqulhaq/activeadmin,tjgrathwell/activeadmin,artofhuman/activeadmin,jclay/active_admin,javierjulio/activeadmin,hyperoslo/activeadmin,Some1Else/activeadmin,deivid-rodriguez/activeadmin,mateusg/active_admin,adibsaad/activeadmin,rtrepo/activeadmin,saiqulhaq/activeadmin,Some1Else/activeadmin,danielevans/activeadmin,hobbes37/activeadmin,buren/activeadmin,Skulli/activeadmin,bloomrain/activeadmin,buren/activeadmin,gogovan/activeadmin,bcavileer/activeadmin,Amandeepsinghghai/activeadmin,FundingGates/activeadmin,thomascarterx/activeadmin,mateusg/active_admin,alonerage/activeadmin,zfben/activeadmin,adibsaad/activeadmin,saveav/activeadmin,dalegregory/activeadmin,Andrekra/activeadmin,strivedi183/activeadmin,jethroo/activeadmin,waymondo/active_admin,saiqulhaq/activeadmin,temochka-test/activeadmin,krautcomputing/activeadmin,waymondo/active_admin,mynksngh/activeadmin,danielevans/activeadmin,chdem/activeadmin,h2ocube/active_admin,hyperoslo/activeadmin,mauriciopasquier/active_admin,keichan34/active_admin,iguchi1124/activeadmin,bcavileer/activeadmin,temochka-test/activeadmin,halilim/activeadmin,sanyaade-iot/activeadmin,iuriandreazza/activeadmin,hobbes37/activeadmin,waymondo/active_admin,strivedi183/activeadmin,siutin/activeadmin,buren/activeadmin,presskey/activeadmin,yeti-switch/active_admin,maysam/activeadmin,bolshakov/activeadmin,Andrekra/activeadmin,mynksngh/activeadmin,mwlang/active_admin,artofhuman/activeadmin,chrisseldo/activeadmin,Ryohu/activeadmin,dannyshafer/activeadmin,varyonic/activeadmin,gogovan/activeadmin,mateusg/active_admin,sharma1nitish/activeadmin,westonplatter/activeadmin,beyondthestory/activeadmin,dannyshafer/activeadmin,quikly/active_admin,timoschilling/activeadmin,tjgrathwell/activeadmin,alonerage/activeadmin,FundingGates/activeadmin,lampo/activeadmin,vraravam/activeadmin,mwlang/active_admin,ishumilova/activeadmin,javierjulio/activeadmin,mediebruket/activeadmin,sanyaade-iot/activeadmin,Skulli/activeadmin,mohitnatoo/activeadmin,whatcould/active_admin,Some1Else/activeadmin,getkiwicom/activeadmin,ishumilova/activeadmin,halilim/activeadmin,alonerage/activeadmin,mauriciopasquier/active_admin,sharma1nitish/activeadmin,quikly/active_admin,whatcould/active_admin,zfben/activeadmin,totzyuta/activeadmin,SoftSwiss/active_admin,hobbes37/activeadmin,wspurgin/activeadmin,Davidzhu001/activeadmin,applexiaohao/activeadmin,quikly/active_admin,mynksngh/activeadmin,Ibotta/activeadmin,Amandeepsinghghai/activeadmin,seanski/activeadmin,bcavileer/activeadmin,zfben/activeadmin,SoftSwiss/active_admin,cmunozgar/activeadmin,mohitnatoo/activeadmin,temochka-test/activeadmin,saveav/activeadmin,cmunozgar/activeadmin,iuriandreazza/activeadmin,maysam/activeadmin,mrjman/activeadmin,mediebruket/activeadmin,senid231/activeadmin,whatcould/active_admin,iuriandreazza/activeadmin,saveav/activeadmin,hiroponz/activeadmin,lampo/activeadmin,applexiaohao/activeadmin,chrisseldo/activeadmin,halilim/activeadmin,samvincent/active_admin,activeadmin/activeadmin,vytenis-s/activeadmin,scarver2/activeadmin,dalegregory/activeadmin,varyonic/activeadmin,shishir127/activeadmin,mediebruket/activeadmin,hyperoslo/activeadmin,Moha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