Fix upgrade on windows and tests

[beppler]

On Windows the executable can not be removed while it is running, but we can rename it and then finish the upgrade.

Also added a new version of the constructor named NewGoBrewDirectory.

With this new constructor all tests related to version management and upgrade can run in isolated directories.

[beppler]

The failure on macos-latest is due to a rate limit on the api used on version check.

[codecov-commenter]

Codecov Report

Merging #96 (b3ed825) into master (656790f) will increase coverage by 0.17%. The diff coverage is 37.50%.

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@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
+ Coverage   51.56%   51.73%   +0.17%     
==========================================
  Files           1        1              
  Lines         479      489      +10     
==========================================
+ Hits          247      253       +6     
+ Misses        205      198       -7     
- Partials       27       38      +11     

Impacted Files	Coverage Δ
gobrew.go	51.73% <37.50%> (+0.17%)	:arrow_up:

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