Readme update

Just proper installation command how it is done with modern Go.

Constants to have rule part in their names.

Constants now have rule part in there name, they look like constantRuleName... now.

Processing fixes

• Ensure utility returns not 0 If translation failed
• Introduce tests on intentionally wrong rules checking they cannot be compiled

Bugfix LOL

v0.4.12

i44 | fix: add rune and string validation

Bugfix

v0.4.9

fix: try again to get build back

Updated dependency to bring CI back

v0.4.8

fix: update gosrcfmt dep

Custom types support

Custom types in fields are supported. They (types) should be predeclared with their name and import path for external ones.

Something like

type time.Time from "time";
type localType;

Rule = Time(time.Time) ' ' LocalValue(localType);

Grammar fix

Grammar fix based on https://stackoverflow.com/questions/17844248/when-is-eof-needed-in-antlr-4

Check length comment

Put comment in front of check length action

Fixes issue-19

Fixed a bug when action like *'@' generates broken code for --go-string