Added template functions: split, toJSON.
Example: {{ "1,2,3" | split "," | toJSON }} in template will result in ["1","2","3"].
Updated from github.com/caarlos0/env/v6 to github.com/caarlos0/env/v10.
Fixed golangci-lint warnings.
Full Changelog: v1.9...v1.10