Create spectroscopy-letters

I've started working from the applied spectroscopy style as mentioned in the summary. 
There are still a few issues, but at least it seems to be compliant to 100% with journal references
Issue: a comma after the date still appears in the book references and I didn't know how to remove it. Probably it works with conditionals...)
Oh thanks. I missed that while creating the style.
Should I edit myself somehow, or does the GITHUB team give its last word and make the last edit before putting the style in the repository?
Sorry, as you see I'm new and it's the first time I do this.