Add travis pypi deploy machinery

.travis.yml

@@ -1,8 +1,16 @@
 language: python
 python:
-  - "2.7"
-  - "3.5"
-  - "3.6"
-
-install: pip install pipenv tox-travis  # The test command will install all necessary other deps
+- '2.7'
+- '3.5'
+- '3.6'
+install: pip install pipenv tox-travis
 script: make ci-test
+
+deploy:
+  provider: pypi
+  user: dfuchs
+  password:
+    secure: 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
+  distributions: "sdist bdist_wheel"
+  on:
+    tags: true

CHANGELOG.md

@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 
 The format is (loosely) based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## 3.0.0
+
+This plugin is now installable from PyPI, which will make it easier to keep
+updated with bug fixes and new features.  As a result, the installation process
+is different.  The README has the updated installation process.  If you are
+currently using this plugin, you will want to install this version using the
+new installation process.
+
 ## 2.0.1
 
 Thanks again to @vladimir-mencl-eresearch for fixing a bug where dicts or lists definied in Jinja wouldn't be recursively merged.