Fix capitalization in reference to `consts.ts`
Fix capitalization in reference to `consts.ts`

This matters on case-sensitive filesystems---that is, it arises on Linux but
generally doesn't come up on Windows or OS X. On ext4 and other
case-sensitive filesystems, TypeScript and Node can't find `consts.ts` when it
is references as `Consts`.

navaei/BotBuilder,Clairety/ConnectMe,jockorob/BotBuilder,mmatkow/BotBuilder,yakumo/BotBuilder,mmatkow/BotBuilder,digibaraka/BotBuilder,Clairety/ConnectMe,mmatkow/BotBuilder,msft-shahins/BotBuilder,stevengum97/BotBuilder,msft-shahins/BotBuilder,xiangyan99/BotBuilder,yakumo/BotBuilder,digibaraka/BotBuilder,yakumo/BotBuilder,jockorob/BotBuilder,jockorob/BotBuilder,dr-em/BotBuilder,navaei/BotBuilder,dr-em/BotBuilder,yakumo/BotBuilder,stevengum97/BotBuilder,navaei/BotBuilder,navaei/BotBuilder,xiangyan99/BotBuilder,mmatkow/BotBuilder,xiangyan99/BotBuilder,msft-shahins/BotBuilder,Clairety/ConnectMe,dr-em/BotBuilder,digibaraka/BotBuilder,dr-em/BotBuilder,msft-shahins/BotBuilder,Clairety/ConnectMe,stevengum97/BotBuilder,jockorob/BotBuilder,digibaraka/BotBuilder,xiangyan99/BotBuilder,stevengum97/BotBuilder