Akihiro Motoki 5e07d03f90 doc: Remove errant newline in the plugin tutorial
{% include %} syntax cannot have a newline.

Closes-Bug: #1774054

This commit also cleans up several things.

* setup.cfg: Rename "classifiers" to the correct keyword "classifier"
* setup.cfg: Add Python 3 classifier
* Quote literals

Change-Id: I14c2217a69ea489c72b311b26b5eb4a5e4865059
2019-01-09 02:06:03 +09:00
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