Document releases.

PiperOrigin-RevId: 218249830

Author: cweill

Diff for: RELEASE.md

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+<!-- Copyright 2018 The AdaNet Authors. All Rights Reserved.
+
+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.
+==============================================================================-->
+
+# Current version (0.2.0-dev)
+ * Under development.
+
+# Release 0.1.0
+ * Initial AdaNet release.
+
+## Requirements
+ * tf-nightly>=1.7.0.dev20180308 || tensorflow>=1.7.0rc0