Homebrew tap for Simple 2D

Install this tap using:

brew tap simple2d/tap
brew install simple2d

Or, install the latest development release using:

brew install --HEAD simple2d

Updating the formula

When a new Simple 2D release is out, do the following:

Update the version number in simple2d.rb
Calculate the new sha256 checksums for the source code release archive and Apple assets, for example using shasum -a 256 <file>
Run brew audit --strict ./simple2d.rb to detect any issues with the formula
Test installation of the formula using brew install ./simple2d.rb
Commit and push changes