Version 0.4.0

What's Changed

• Improve env file handling by @mre in #113
• Add envy find command to find environment variables by name by @mre in #119
• List loaded vars from each .env file; refactoring by @mre in #120
• Add envy load for one-time loading by @mre in #121
• More-shells (bash, fish) by @mre in #128

Full Changelog: 0.3.3...0.4.0