Render README on pypi as markdown, update twine, fix a couple README bits

README.md

@@ -1,4 +1,4 @@
-<img src="/docs/logos/octodns-logo.png?" height=251 width=404>
+<img src="https://raw.githubusercontent.com/github/octodns/master/docs/logos/octodns-logo.png?" height=251 width=404>
 
 ## DNS as code - Tools for managing DNS across multiple providers
 
@@ -275,4 +275,4 @@ GitHub® and its stylized versions and the Invertocat mark are GitHub's Trademar
 
 ## Authors
 
-OctoDNS was designed and authored by [Ross McFarland](https://github.com/ross) and [Joe Williams](https://github.com/joewilliams). It is now maintained, reviewed, and tested by Ross, Joe, and the rest of the Site Reliability Engineering team at GitHub.
+OctoDNS was designed and authored by [Ross McFarland](https://github.com/ross) and [Joe Williams](https://github.com/joewilliams). It is now maintained, reviewed, and tested by Traffic Engineering team at GitHub.

requirements-dev.txt

@@ -6,4 +6,4 @@ pycountry>=18.12.8
 pycountry_convert>=0.7.2
 pyflakes==1.6.0
 requests_mock
-twine==1.11.0
+twine==1.13.0

setup.py

@@ -41,6 +41,7 @@ setup(
     ],
     license='MIT',
     long_description=open('README.md').read(),
+    long_description_content_type='text/markdown',
     name='octodns',
     packages=find_packages(),
     url='https://github.com/github/octodns',