Update to make TOC syntax be case-insensitive
Update to make TOC syntax be case-insensitive

hackmdio/hackmd,ironhack/hackmd,jccrofty30/hackmd,PeterDaveHello/hackmd,PeterDaveHello/hackmd,ironhack/hackmd,jackycute/HackMD,hackmdio/hackmd,Yukaii/hackmd,Yukaii/hackmd,Rwing/hackmd,jccrofty30/hackmd,ironhack/hackmd,jackycute/HackMD,jackycute/HackMD,Rwing/hackmd,jccrofty30/hackmd,aswathyjacob8/newtest,PeterDaveHello/hackmd,Yukaii/hackmd,Rwing/hackmd,hackmdio/hackmd,aswathyjacob8/newtest,aswathyjacob8/newtest