Add MINIMAL pragma to Vector & MVector type classes

Fixes #11

Author: Shimuuar

Data/Vector/Generic/Base.hs

@@ -145,4 +145,5 @@ class MVector (Mutable v) a => Vector v a where
   {-# INLINE elemseq #-}
   elemseq _ = \_ x -> x
 
-
+  {-# MINIMAL basicUnsafeFreeze, basicUnsafeThaw, basicLength,
+              basicUnsafeSlice, basicUnsafeIndexM #-}

Data/Vector/Generic/Mutable/Base.hs

@@ -145,3 +145,6 @@ class MVector v a where
     where
       n = basicLength v
 
+  {-# MINIMAL basicLength, basicUnsafeSlice, basicOverlaps,
+              basicUnsafeNew, basicInitialize, basicUnsafeRead,
+              basicUnsafeWrite #-}