Missing grammar for assembly switch statements

[guilhermejcgois]

Seems that language grammar in solidity.pegjs is incomplete,, I haven't found statements for switch, case, default, break and continue.

[duaraghav8]

@guilhermejcgois thanks for reporting this. Though I take out time to maintain this package quite often, I have limited bandwidth and might take some time before getting to resolve this issue. So if you'd be interested in submitting a PR I'd be happy to incorporate that

[guilhermejcgois]

Sure! I'll try to take a look this weekend :)