New keyword `emit`

[wbt]

As of solidity 0.4.21, the emit keyword was introduced and "Invoking events without "emit" prefix is deprecated.".

emit should be colored as a keyword.

See also argotorg/solidity#2182 for additional reserved words coming soon.

[davidhq]

Hi, this was added in github.com/davidhq/SublimeEthereum, can this package please be updated (autogenerated) again ? thank you!