Add gql quasi quoter

tests/Language/GraphQL/ClassSpec.hs

@@ -3,6 +3,7 @@
    obtain one at https://mozilla.org/MPL/2.0/. -}
 
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE TemplateHaskell #-}
 module Language.GraphQL.ClassSpec
     ( spec
@@ -17,6 +18,7 @@ import Language.GraphQL.Class
     , ToGraphQL(..)
     , deriveFromGraphQL
     , deriveToGraphQL
+    , gql
     )
 import Test.Hspec (Spec, describe, it, shouldBe)
 import qualified Data.HashMap.Strict as HashMap
@@ -159,3 +161,14 @@ spec = do
             let given = Type.Enum "TWO_FIELD_ENUM_2"
                 expected = TWO_FIELD_ENUM_2
              in fromGraphQL given `shouldBe` Just expected
+
+    describe "gql" $
+        it "replaces CRNL with NL" $
+            let expected :: Text
+                expected = "line1\nline2\nline3"
+                actual = [gql|
+                  line1
+                  line2
+                  line3
+                |]
+             in actual `shouldBe` expected