Add license (#76)

* Add license to .errcheckignore

* Add license to pkg/config/BUILD.bazel

.errcheckignore

@@ -1 +1,15 @@
+# Copyright 2019 The Protocol Buffers Language Server Authors.
+#
+# 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.
+
 go.uber.org/multierr.Append

pkg/config/BUILD.bazel

@@ -1,3 +1,17 @@
+# Copyright 2019 The Protocol Buffers Language Server Authors.
+#
+# 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.
+
 load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(