Fix cobertura number of hits to detect multiple digit executions

[MatthewTHFisher]

Fixes #26

Adjusts the CoverageConverter's regex pattern to support lines that have been executed more than 9 times.

[a7ex]

Thanks for the collaboration. Very much appreciated

[MatthewTHFisher]

Happy to help! Will keep my eyes out for the next release 👀

[a7ex]

Stay tuned, just going through the changes. The --json for the xclv tool didn't exist, when I wrote the tool. Therefore the initial purpose of this tool is gone.
However I added a few more things like parsing the test results for sonar, which still make it valuable for me.
I will now look into the changes and merge it and also make the same changes to the sonar coverage class and release a new version later today.