Add .graphql support (#111)

* Bootstrap

* Add GraphQL tests to `initial` and `expected`

* Add missing comma

Author: SleepySquash

main.go

@@ -323,6 +323,7 @@ func licenseHeader(path string, tmpl *template.Template, data licenseData) ([]by
 		".bzl", ".bazel", "build", ".build",
 		".dockerfile", "dockerfile",
 		".ex", ".exs",
+		".graphql",
 		".jl",
 		".nix",
 		".pl",

main_test.go

@@ -348,6 +348,7 @@ func TestLicenseHeader(t *testing.T) {
 				"f.bzl", "f.bazel", "build", "f.build",
 				"f.dockerfile", "dockerfile",
 				"f.ex", "f.exs",
+				"f.graphql",
 				"f.jl",
 				"f.nix",
 				"f.pl",

testdata/expected/file.graphql

@@ -0,0 +1,22 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+query HeroNameAndFriends {
+  hero {
+    name
+    friends {
+      name
+    }
+  }
+}

testdata/initial/file.graphql

@@ -0,0 +1,8 @@
+query HeroNameAndFriends {
+  hero {
+    name
+    friends {
+      name
+    }
+  }
+}