Merge pull request #49 from eikenb/issue-48-single-quote-parseenv

Fix issue 48: single-quote+ParseEnv bug

Merge pull request #46 from johejo/wrap_error

Use fmt.Errorf to be able to unwrap error

Merge pull request #37 from mattn/fix-36

Fix #36

Revert change of go.mod

Add test

Merge pull request #31 from marckhouzam/fix/emptyArg

Support empty arguments

Do not specify version

Merge pull request #23 from mattn/dollar-fix

Handle FOO=$(command)

Merge pull request #22 from radeksimko/go-mod

Enable go modules

update README.md