Advertise --fast --pedantic with stack

Author: phadej

CONTRIBUTING.md

@@ -11,9 +11,9 @@ repository. You can use `cabal`:
 Or `stack`:
 
 ```shell
-stack setup    # Downloads and installs a proper GHC version if necessary
-stack build    # Install and build packages
-stack test     # Run all the tests
+stack setup                    # Downloads and installs a proper GHC version if necessary
+stack build --fast --pedantic  # Install dependencies and build packages
+stack test                     # Run all the tests
 ```
 
 Or `nix`: