Configure Coveralls to not report a failure on minor decreases of test coverage

[jspanjers]

It seems most of the Coveralls test fails with a decreased coverage of 0.0%.
However, when I look at the Coveralls details, I do not notice any decreased coverage.
Maybe this is a rounding error?

Would it be possible to change the 'Coverage Decrease Threshold for failure' on https://coveralls.io/github/rubyzip/rubyzip/settings to something like, 0.1% ?

Yes, I hate Coveralls being so touchy by default, and I had no idea it could be adjusted! Also, while I like decent coverage, I'm not super bothered about it going up or down a bit when it's over 90% anyway. I'd be happy to have 90% as the threshold and then stop worrying about it. Unfortunately I don't have the required access to set this, as I'm not an owner of the rubyzip repo - maybe @jdleesmiller could set the threshold? Thanks!

Originally posted by @hainesr in #488 (comment)

[jdleesmiller]

Agree that is annoying! I've set it to 0.5%.