fix: default branch assumes *master*

[ghinks]

During testing using a parent repo that had a dependency upon.

The repos did not use master but main I found issues as the default branch was hardcoded to master.

I created a getDefaultBranch query to get the default branch to github.js

I added both unit and integration tests to cover this.

This is the first time I have used tap and am glad of advice :)

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[ghinks]

Looking at the tests again as they pass locally. Looks like osx !== ubuntu.

[ghinks]

still in progress, a few more bits to tidy up yet.

[ghinks]

still a work in progress, looking at things I broke on the result call now.

[ghinks]

I had a look at the query you suggested and it looks like a much better way to do things. I will close this PR and open another with that change.