fix: match only against the end of a file path.

[pat]

Otherwise if there happens to be .rb in a directory name, that'll be incorrectly modified as well.

I haven't added a test as this code is part of loading everything, rather than something that occurs once the library is loaded.

Checklist

• [x] I acknowledge that all my contributions will be made under the project's license
• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the Contribution Guidelines and my PR follows them
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• [ ] I have added tests that prove my fix is effective or that my feature works
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• [x] I have added inline documentation to the code I modified

[broksonic21]

thanks for this one - we ran into it too (see https://github.com/twilio/twilio-ruby/issues/655 )

[jcavena]

Thanks for the fix!