XmlWriterService and TranscriptionFileService not showing up in code coverage report

[nairmai]

As referred to in #77 , when you run npm run test from the top-level, there is no code coverage report for XmlWriterService or TranscriptionFileService, even though there are tests written for both of these:

Right now in d-ser-t-service/jest.json there is:

"collectCoverageFrom": [
     "<rootDir>/**/src/**/*[!.test].ts"
 ]