YAML generation for init inserts tabs for lines 3 and 5

[digitalsleuth]

When using cast to generate a .cast.yml file, the file is generated with tabs on lines 3 and 5 (comment lines)
If an end user simply deletes only the visible text on these lines and not the tabs, then uses the release option to generate a release, cast will fail with: FATA[0000] unable to load config: yaml: line 3: found character that cannot start any token. Additionally, if the end user opts to leave the commented lines in, the same issue will arise.

While this is a very minor issue, it does induce a potential future error. Replacing the tab with spaces will ensure this doesn't occur in the future, whether the end user thinks to replace the entire line or not.

[ekristen]

Weird. Easy enough fix.