Use correct github url to find commands.json
Use correct github url to find commands.json

Once this is merged:
  - merge the latest changes to commands.json in antirez/redis-doc
  - re-run: utils/generate-command-help.rb > src/help.h

Then we'll have nice and easy tab-completed help in redis-cli again.

Closes #1909

quangnguyen90/redis,ideaar/redis,Cybermaxs/redis,jqk6/redis,shanegxxiao/redis,jqk6/redis,jacklee0810/redis,kolonse/redis,erwin00776/redis-2.8-optimize,liqiang199105/redis,alpha8/redis,adamweixuan/redis,kts12345/redis,quangnguyen90/redis,Jonavin/redis,damy/redis,laurencee/redis,liqiang199105/redis,ideaar/redis,miminus/redis,liqiang199105/redis,ScottKaiGu/redis,jacklee0810/redis,hanmichael/redis,enginekit/redis,nandhanurrevanth/redis,kolonse/redis,jaambee/redis,shanegxxiao/redis,damy/redis,damy/redis,enginekit/redis,LittlePeng/redis,nandhanurrevanth/redis,jacklee0810/redis,damy/redis,Cybermaxs/redis,StartTheShift/redis-shift,Jonavin/redis,alpha8/redis,Jonavin/redis,Cybermaxs/redis,fanxu/redis,kts12345/redis,upsoft/redis,jqk6/redis,quangnguyen90/redis,adamweixuan/redis,kolonse/redis,hanmichael/redis,jaambee/redis,miminus/redis,upsoft/redis,hanmichael/redis,laurencee/redis,Jonavin/redis,kts12345/redis,nandhanurrevanth/redis,janeasystems/redis,jaambee/redis,janeasystems/redis,alpha8/redis,ScottKaiGu/redis,janeasystems/redis,nandhanurrevanth/redis,sidsen/redis,erwin00776/redis-2.8-optimize,kolonse/redis,Cybermaxs/redis,fanxu/redis,alpha8/redis,quangnguyen90/redis,upsoft/redis,ScottKaiGu/redis,upsoft/redis,Cybermaxs/redis,adamweixuan/redis,ScottKaiGu/redis,quangnguyen90/redis,laurencee/redis,kts12345/redis,jaambee/redis,jaambee/redis,erwin00776/redis-2.8-optimize,damy/redis,shanegxxiao/redis,hanmichael/redis,liqiang199105/redis,hanmichael/redis,upsoft/redis,shanegxxiao/redis,LittlePeng/redis,janeasystems/redis,enginekit/redis,janeasystems/redis,enginekit/redis,adamweixuan/redis,sidsen/redis,sidsen/redis,fanxu/redis,ScottKaiGu/redis,sidsen/redis,jqk6/redis,laurencee/redis,StartTheShift/redis-shift,Jonavin/redis,alpha8/redis,enginekit/redis,adamweixuan/redis,liqiang199105/redis,fanxu/redis,StartTheShift/redis-shift,kts12345/redis,sidsen/redis,ideaar/redis,shanegxxiao/redis,jqk6/redis,nandhanurrevanth/redis,miminus/redis,jacklee0810/redis,LittlePeng/redis,sidsen/redis,erwin00776/redis-2.8-optimize,kolonse/redis,ideaar/redis,ideaar/redis,miminus/redis,laurencee/redis,jacklee0810/redis,miminus/redis