Add 'adoc' as a file extension for asciidoc
Add 'adoc' as a file extension for asciidoc

This is to match the behaviour that GitHub have

Scheirle/pelican,karlcow/pelican,Summonee/pelican,deved69/pelican-1,deved69/pelican-1,goerz/pelican,11craft/pelican,talha131/pelican,number5/pelican,joetboole/pelican,GiovanniMoretti/pelican,JeremyMorgan/pelican,sunzhongwei/pelican,florianjacob/pelican,kernc/pelican,sunzhongwei/pelican,Polyconseil/pelican,simonjj/pelican,ehashman/pelican,treyhunner/pelican,TC01/pelican,btnpushnmunky/pelican,joetboole/pelican,51itclub/pelican,iKevinY/pelican,rbarraud/pelican,janaurka/git-debug-presentiation,koobs/pelican,florianjacob/pelican,catdog2/pelican,51itclub/pelican,zackw/pelican,HyperGroups/pelican,kennethlyn/pelican,arty-name/pelican,Polyconseil/pelican,jvehent/pelican,HyperGroups/pelican,iurisilvio/pelican,HyperGroups/pelican,lazycoder-ru/pelican,jo-tham/pelican,JeremyMorgan/pelican,deved69/pelican-1,karlcow/pelican,Rogdham/pelican,jimperio/pelican,lucasplus/pelican,iKevinY/pelican,garbas/pelican,jimperio/pelican,Rogdham/pelican,florianjacob/pelican,deanishe/pelican,simonjj/pelican,ehashman/pelican,deanishe/pelican,avaris/pelican,gymglish/pelican,btnpushnmunky/pelican,talha131/pelican,TC01/pelican,JeremyMorgan/pelican,number5/pelican,catdog2/pelican,lucasplus/pelican,Summonee/pelican,douglaskastle/pelican,abrahamvarricatt/pelican,abrahamvarricatt/pelican,lucasplus/pelican,abrahamvarricatt/pelican,garbas/pelican,goerz/pelican,sunzhongwei/pelican,rbarraud/pelican,jo-tham/pelican,farseerfc/pelican,TC01/pelican,rbarraud/pelican,alexras/pelican,Rogdham/pelican,Summonee/pelican,eevee/pelican,zackw/pelican,karlcow/pelican,Scheirle/pelican,eevee/pelican,ingwinlu/pelican,alexras/pelican,ingwinlu/pelican,GiovanniMoretti/pelican,goerz/pelican,0xMF/pelican,Scheirle/pelican,jimperio/pelican,getpelican/pelican,farseerfc/pelican,treyhunner/pelican,douglaskastle/pelican,joetboole/pelican,11craft/pelican,ls2uper/pelican,zackw/pelican,levanhien8/pelican,kernc/pelican,iurisilvio/pelican,11craft/pelican,gymglish/pelican,avaris/pelican,koobs/pelican,number5/pelican,levanhien8/pelican,janaurka/git-debug-presentiation,ehashman/pelican,btnpushnmunky/pelican,simonjj/pelican,eevee/pelican,alexras/pelican,gymglish/pelican,crmackay/pelican,lazycoder-ru/pelican,UdeskDeveloper/pelican,UdeskDeveloper/pelican,ls2uper/pelican,kennethlyn/pelican,douglaskastle/pelican,crmackay/pelican,lazycoder-ru/pelican,51itclub/pelican,janaurka/git-debug-presentiation,iurisilvio/pelican,deanishe/pelican,justinmayer/pelican,levanhien8/pelican,jvehent/pelican,kennethlyn/pelican,ls2uper/pelican,koobs/pelican,getpelican/pelican,crmackay/pelican,kernc/pelican,treyhunner/pelican,GiovanniMoretti/pelican,garbas/pelican,sunzhongwei/pelican,jvehent/pelican,catdog2/pelican,UdeskDeveloper/pelican