Update build status badge to use https

README.md

diff --git a/README.md b/README.md
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--- a/README.md
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 # Bazel Python Rules
 
-[![Build Status](http://ci.bazel.io/buildStatus/icon?job=rules_python)](http://ci.bazel.io/job/rules_python)
+[![Build Status](https://ci.bazel.io/buildStatus/icon?job=rules_python)](https://ci.bazel.io/job/rules_python)
 
 ## Rules