add meta prepare for goreleaser to use

Signed-off-by: Liam Stanley <me@liamstanley.io>

chore(deps): upgrade go deps

feat: add env-delim support for env vars

Signed-off-by: Liam Stanley <me@liamstanley.io>

add custom language support (closes #14)

- new formatting for vue/js files
- add lang customization to api docs

Signed-off-by: Liam Stanley <me@liamstanley.io>

add go-build test step

Signed-off-by: Liam Stanley <me@liamstanley.io>

utilize latest go version from go-versions

upgrade to go 1.15