Fix lint issue (#21)

Disable debug level logs (#17)

Use panic when Watch called before read (#16)

Watch method to track config file changes (#15)

* Watch to track config file changes

* Check missed error in test

Custom env var names (#12)

* Support of envvar tag

* Update documentation

Merge pull request #11 from num30/clean-deps

Remove golangci dependency

Merge pull request #8 from num30/no-env-prefix

Don't use prefix for env vars by default

Merge pull request #6 from num30/golint

Use golintci for linting

Add slice to an example

Fix go reference and reformat emojis to look nice in go-docs