possible error with srp-Cyrl

[n8rob]

• What kind of change does this PR introduce? Bug fix

• Checklist

• [] Have you added adequate tests on epitran/test?
• [] Have you updated the language list in README.md?
• [] Does it follow the - format?
• [] Have you used IPA ɡ, not latin small letter g?

• Sources of information for the test samples (I'm a native speaker, books, online resources, ...)

• Sources of information for the rules (I'm a native speaker, books, online resources, ...)

• What is the current behavior?

Currently it seems one letter is absent and another letter is incorrectly mapped, per these sources:

• Preply Serbian sound guide
• Wikipedia IPA guide
• Serbian textbook (page 10 in the PDF, page 3 printed)

Note that the Wikipedia source also shows some disagreements with the sound mappings here, though they are less egregious and may vary dialectally (e.g. /o/ instead of /ɔ/).

• What is the new behavior (if this is a feature change)?

I fixed the mappings to match these references. There doesn't seem to be any issues caused, and I don't think there will be since Serbian (srp) does not have any post- or pre-processing data that I can see.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No

[juice500ml]

Hey, thanks Nate! It seems that there were some issues in the CI, can you rebase/merge the current master branch to your srp-fix branch, such that we can retrigger the CI? Just now I (hopefully) fixed the CI in the master branch in previous merges.