update project metadata

new readme
readme as setup.py long_description
links in changes
git in authors
add travis osx env
break out docs build in travis
remove python_requires for now

README.rst

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+Flask
+=====
+
+Flask is a lightweight `WSGI`_ web application framework. It is designed
+to make getting started quick and easy, with the ability to scale up to
+complex applications. It began as a simple wrapper around `Werkzeug`_
+and `Jinja`_ and has become one of the most popular Python web
+application frameworks.
+
+Flask offers suggestions, but doesn't enforce any dependencies or
+project layout. It is up to the developer to choose the tools and
+libraries they want to use. There are many extensions provided by the
+community that make adding new functionality easy.
+
+
+Installing
+----------
+
+Install and update using `pip`_:
+
+.. code-block:: text
+
+    pip install -U Flask
+
+
+A Simple Example
+----------------
+
+.. code-block:: python
+
+    from flask import Flask
+
+    app = Flask(__name__)
+
+    @app.route('/')
+    def hello():
+        return 'Hello, World!'
+
+.. code-block:: none
+
+    $ FLASK_APP=hello.py flask run
+     * Running on http://localhost:5000/
+
+
+Links
+-----
+
+* Website: https://www.palletsprojects.com/p/flask/
+* Releases: https://pypi.org/project/Flask/
+* Code: https://github.com/pallets/flask
+* Issue tracker: https://github.com/pallets/flask/issues
+* Test status:
+
+  * Linux, Mac: https://travis-ci.org/pallets/flask
+  * Windows: https://ci.appveyor.com/project/pallets/flask
+
+* Test coverage: https://codecov.io/gh/pallets/flask
+
+.. _WSGI: https://wsgi.readthedocs.io
+.. _Werkzeug: https://www.palletsprojects.com/p/werkzeug/
+.. _Jinja: https://www.palletsprojects.com/p/jinja/
+.. _pip: https://pip.pypa.io/en/stable/quickstart/