Converter responsible for ensuring that retrieval intent actions in stories
utter_ instead of
Only consider YAML story files.
source_path- Path to the training data file.
True if the given file can is a YAML stories file,
Migrate retrieval intent responses to the new 2.0 format in stories.
Before 2.0, retrieval intent responses needed to start
respond_. Now, they need to start with
source_path- the source YAML stories file
output_path- Path to the output directory.