Add missing copyright headers

Change-Id: I1d9555a8dc06cf7fe3fcdd6a2ddeb9409e2cd157
diff --git a/RELEASING.md b/RELEASING.md
index b039b03..bb7fa40 100644
--- a/RELEASING.md
+++ b/RELEASING.md
@@ -1,3 +1,9 @@
+<!-- Copyright 2018 Google LLC
+
+Use of this source code is governed by an MIT-style
+license that can be found in the LICENSE file or at
+https://opensource.org/licenses/MIT. -->
+
 Releasing Instructions
 ======================
 
diff --git a/rustfmt.toml b/rustfmt.toml
index 57d9942..0af02c6 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -1,3 +1,9 @@
+# Copyright 2019 Google LLC
+#
+# Use of this source code is governed by an MIT-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/MIT.
+
 # Fuchsia Format Style
 # last reviewed: Jan 29, 2019
 
diff --git a/tests/symbol_version_name.rs b/tests/symbol_version_name.rs
index 7dbf2ad..fd69f95 100644
--- a/tests/symbol_version_name.rs
+++ b/tests/symbol_version_name.rs
@@ -1,3 +1,9 @@
+// Copyright 2018 Google LLC
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
 use std::process::Command;
 
 // Relative to CARGO_MANIFEST_DIR