Updated Grammar files

[johndpope]

https://raw.githubusercontent.com/protostuff/protostuff-compiler/15d05631d3c9fc211fa898a9eecc46eb2578a92f/protostuff-parser/src/main/antlr4/io/protostuff/compiler/parser/ProtoParser.g4

https://raw.githubusercontent.com/protostuff/protostuff-compiler/15d05631d3c9fc211fa898a9eecc46eb2578a92f/protostuff-parser/src/main/antlr4/io/protostuff/compiler/parser/ProtoLexer.g4

[yesme]

@johndpope Could you submit a pull request?

[paulvi]

Will this solve #2 proto3 support?

[johndpope]

@paulvi - I think it will.

I have a swift proto walker here
https://github.com/johndpope/Antlr-Swift-runtime

closing out this ticket as a spring cleaning exercise.

[Restioson]

+1. What happened to this? Is Proto3 still planned? The PR was never made.

[johndpope]

if you download files above then drag and drop into webbrowse onyour fork on webpage - it's simple to create PR.

[Restioson]

Cool, I'll make it then. Wanted to make sure the repo was still active, looked a bit dead with last 8 month activity

[Restioson]

Made PR #4