Ensure template has an EOL character when rendering #81

[deviantintegral]

Summary

Fixes #81 .

Alternatives Considered

We could use sed for this as well, but that seems more complicated. There's no harm in an extra blank line for the case where the file contains it like normal.

Testing Steps

1. Remove the trailing newline from a configuration file: https://stackoverflow.com/questions/1050640/how-to-stop-vim-from-adding-a-newline-at-end-of-file
2. Run the addon with the config file.
3. It should work instead of erroring out parsing the configuration.