Check CMake files for copyrights (#1509)

* Check CMake files for copyrights

* Add missing copyright

Author: wilhuff

Firestore/Protos/CMakeLists.txt

@@ -1,3 +1,17 @@
+# Copyright 2018 Google
+#
+# 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.
+
 cc_library(
   firebase_firestore_protos_nanopb
   SOURCES

scripts/check_copyright.sh

@@ -21,8 +21,9 @@ options=(
   'Copyright [0-9]{4}.*Google'
 )
 
-git grep "${options[@]}" \
-    -- '*.'{c,cc,h,js,m,mm,py,rb,sh,swift} \
+git grep "${options[@]}" -- \
+    '*.'{c,cc,cmake,h,js,m,mm,py,rb,sh,swift} \
+    CMakeLists.txt '**/CMakeLists.txt' \
     ':(exclude)**/third_party/**'
 if [[ $? == 0 ]]; then
   echo "ERROR: Missing copyright notices in the files above. Please fix."