Add note about matrix.ghc

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Herbert Valerio Riedel 2019-11-07 23:57:19 +01:00 committed by GitHub
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@ -118,3 +118,5 @@ uses: actions/cache@preview
path: ~/.cabal/store
key: ${{ runner.os }}-haskell-${{ matrix.ghc }}
```
Note: `matrix.ghc` denotes the Haskell compiler version (see also https://github.com/actions/setup-haskell)