Enable Use fewer imports hint for HLint. (#488)

* Use fewer imports.

.hlint.yaml

@@ -20,7 +20,6 @@
 - ignore: {name: "Use ?~"} # 5 hints
 - ignore: {name: "Use camelCase"} # 3 hints
 - ignore: {name: "Use concatMap"} # 1 hint
-- ignore: {name: "Use fewer imports"} # 2 hints
 - ignore: {name: "Use fmap"} # 10 hints
 - ignore: {name: "Use lambda-case"} # 3 hints
 - ignore: {name: "Use maybe"} # 1 hint

proto-lens-tests/tests/raw_fields_test.hs

@@ -13,7 +13,7 @@ module Main where
 import Control.Arrow (second)
 import Proto.RawFields
 import Proto.RawFields_Fields
-import Data.ByteString.Builder (word8)
+import Data.ByteString.Builder (Builder, byteString, word8)
 import Data.ProtoLens
 import Lens.Family2 (Lens', (&), (.~))
 import Data.Int (Int32, Int64)
@@ -24,7 +24,6 @@ import Data.Text (Text)
 import qualified Data.Text as Text
 import qualified Data.Text.Lazy as LT
 import Data.Text.Encoding (encodeUtf8)
-import Data.ByteString.Builder (Builder, byteString)
 
 import Data.ProtoLens.TestUtil
 

proto-lens/src/Data/ProtoLens/Encoding/Bytes.hs

@@ -62,14 +62,14 @@ import Data.Semigroup ((<>))
 import qualified Data.Vector.Generic as V
 import Data.Word (Word8, Word32, Word64)
 import Foreign.Marshal (malloc, free)
-import Foreign.Storable (peek)
 import System.IO (Handle, hGetBuf)
 #if MIN_VERSION_base(4,11,0)
 import qualified GHC.Float as Float
+import Foreign.Storable (peek)
 #else
 import Foreign.Ptr (castPtr)
 import Foreign.Marshal.Alloc (alloca)
-import Foreign.Storable (Storable, poke)
+import Foreign.Storable (Storable, peek, poke)
 import System.IO.Unsafe (unsafePerformIO)
 #endif