Notes on dist files [ci skip]

dist/README.md

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+This folder contains prebuilt browser versions of [protobuf.js](https://github.com/dcodeIO/protobuf.js). When sending pull requests, it is not required to update these.
+
+Prebuilt files are in source control to enable pain-free CDN usage through [RawGit](http://rawgit.com/):
+
+Development:
+
+```
+<script src="//cdn.rawgit.com/dcodeIO/protobuf.js/6.0.0/dist/protobuf.js"></script>
+```
+
+Production:
+
+```
+<script src="//cdn.rawgit.com/dcodeIO/protobuf.js/6.0.0/dist/protobuf.min.js"></script>
+```
+
+**NOTE:** Remember to replace the version tag with the exact [release](https://github.com/dcodeIO/protobuf.js/releases) your project depends upon.