0.3.0 Add support for `sprig` functions in Go templates in the `format` argument

what

• Add support for sprig functions in Go templates in the format argument

why

• To be able to manipulate the text of the comments using various functions in Go templates, in particular string replacement and Regular Expressions

GITHUB_COMMENT_FORMAT="Helm diff:<br><br><pre>{{regexReplaceAllLiteral `\\n` . `<br>` }}<pre>"

references

• http://masterminds.github.io/sprig/
• http://masterminds.github.io/sprig/strings.html
• https://github.com/Masterminds/sprig