Remove Monoid instance

Fixing circular dependency

Author: garyb

bower.json

@@ -19,8 +19,7 @@
     "Gruntfile.json"
   ],
   "dependencies": {
-    "purescript-maybe": "*",
-    "purescript-monoid": "*"
+    "purescript-maybe": "*"
   },
   "devDependencies": {
     "purescript-exceptions": "*",

src/Data/Array.purs

@@ -31,7 +31,6 @@ module Data.Array
   ) where
 
 import Data.Maybe
-import Data.Monoid
 import Prelude.Unsafe (unsafeIndex)
 
 infixl 8 !!
@@ -276,9 +275,6 @@ instance monadArray :: Monad []
 instance semigroupArray :: Semigroup [a] where
   (<>) = append
 
-instance monoidArray :: Monoid [a] where
-  mempty = []
-
 instance alternativeArray :: Alternative [] where
   empty = []
   (<|>) = append