Merge pull request #23 from haskell-works/support-older-ghcs

Support older GHCs

Author: newhoggy

package.yaml

@@ -18,7 +18,7 @@ tested-with: GHC == 8.4.2, GHC == 8.2.2, GHC == 8.0.2, GHC == 7.10.3
 dependencies:
 - base            >= 4.8        && < 5
 - bytestring      >= 0.9        && < 0.11
-- ghc-prim        >= 0.5.1.1    && < 0.6
+- ghc-prim        >= 0.4        && < 0.6
 - hw-bits         >= 0.7.0.3    && < 0.8
 - hw-prim         >= 0.6.2.17   && < 0.7
 - mmap            >= 0.5        && < 0.6
@@ -42,7 +42,7 @@ tests:
     - -rtsopts
     - -with-rtsopts=-N
     dependencies:
-    - QuickCheck          >= 2.10       && < 2.12
+    - QuickCheck          >= 2.10       && < 2.13
     - directory           >= 1.2        && < 1.4
     - exceptions          >= 0.8        && < 0.11
     - hedgehog            >= 0.5        && < 0.7