Cobertura coverage-04.dtd validation?

[mmyrte]

While trying to use the coverage report generated by to_cobertura in VS Code for nicely color-coded coverage gutters, I have found the following issues with the XML currently being generated:

• The <method> nodes are currently generated without a complexity attribute, which may or may not be required. Should I add a complexity="0" attribute just for safety's sake? This would entail being explicit about the DTD we claim to adhere to.
• The parser which the above mentioned Coverage Gutters project uses expects a filled <sources> node as child of the <coverage> node. Neither of the two DTDs actually expects at least one child, but I think adding the current working directory would not hurt.

@jimhester has touched the relevant R/cobertura.R before; good if I base a PR off of this issue?

[jimhester]

Sure, that would be great.

[jimhester]

Fixed by #525