update readme with details about libraries doing the heavy lifting

README.md

@@ -6,6 +6,14 @@ So that you don't have to write values.schema.json by hand from scratch for your
 
 [Helm](https://helm.sh) plugin to generate [json schema for values yaml](https://helm.sh/docs/topics/charts/#schema-files)
 
+Nothing fancy about the code, all the heavy lifting is done by:
+
+* [go-jsonschema-generator](https://github.com/karuppiah7890/go-jsonschema-generator) - for generating JSON schema. It's a fork of [this](https://github.com/mcuadros/go-jsonschema-generator). Thanks to [@mcuadros](https://github.com/mcuadros)
+* [go-yaml](https://github.com/go-yaml/yaml/) - for YAML parsing
+* [cobra](https://github.com/spf13/cobra) - for CLI stuff
+* [afero](https://github.com/spf13/afero) - for file reading
+* [The Go stdlib](https://golang.org/pkg/) - for everything else
+
 ## Install
 
 The plugin works with both helm v2 and v3 versions