Fix Yaml jinja Templating

What's Changed

• Yaml fix only by @MACKAT05 in #2

Full Changelog: v0.1.0...v0.1.1

v0.1.0 - Initial Release

This is the inital release.
This extends and adapts the sqlfluff jinja templater to use the schemachange configuration and behavior.
This has no direct dependancy on the schemachange python package so we can avoid some dependancy issues inparticular with numpy.