ci: move to Go 1.12.8 (#48)

compiler: upgrade to Go 1.12 (#41)

compiler: upgrade to Go 1.11.5 (#43)

* Fix bug where usage was shown for all errors in the gopherjs command

* Use version of github.com/shurcooL/vfsgen/cmd/vfsgendev that has
option to not write modTime

* Always run go generate ./... as part of CI

doc: update README with instructions on how to install this fork. (#11)