Exclude directories from the Composer archive

[mnapoli]

Proposed Changes

This results in a lighter package when it is installed in vendor in consuming projects. This makes a difference on AWS Lambda where the package size is limited, and a smaller package implies better performances for cold starts.

See https://madewithlove.com/gitattributes/ for more information.

[codecov[bot]]

Codecov Report

Merging #58 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #58   +/-   ##
=========================================
  Coverage     97.96%   97.96%           
  Complexity      253      253           
=========================================
  Files            18       18           
  Lines           639      639           
=========================================
  Hits            626      626           
  Misses           13       13           

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[hollodotme]

As discussed with @mnapoli via DM:

• I'll merge this PR which will exclude the bin/ directory from releases installed by composer
• I'll remove the link of bin/fcgiget in composer.json and document it as a security fix (because bin/fcgiget accepts any accessible fastCGI endpoint)
• I'll release it as v3.1.2

[mnapoli]

Thank you!