Add disclaimer about alpha release status (bazel-contrib#66)

Douglas Greiman · mattmoor · commit b28c4c7a4c6d · 2018-02-15T21:13:34.000-08:00
diff --git a/README.md b/README.md
@@ -1,4 +1,6 @@
-# Bazel Python Rules
+# Experimental Bazel Python Rules
+
+Status: This is **ALPHA** software.
 
 [![Build Status](https://ci.bazel.io/buildStatus/icon?job=rules_python)](https://ci.bazel.io/job/rules_python)
 
