Change references from master to main.

README.md

@@ -4,7 +4,7 @@ tappy
 [![PyPI version][pypishield]](https://pypi.python.org/pypi/tap.py)
 [![Coverage][coverage]](https://codecov.io/github/python-tap/tappy)
 
-<img align="right" src="https://github.com/python-tap/tappy/blob/master/docs/images/tap.png"
+<img align="right" src="https://github.com/python-tap/tappy/blob/main/docs/images/tap.png"
   alt="TAP logo" />
 
 tappy is a set of tools for working with the
@@ -111,15 +111,10 @@ for tips on how to get started.
 
 [tap]: http://testanything.org/
 [pypishield]: https://img.shields.io/pypi/v/tap.py.svg
-[license]: https://img.shields.io/pypi/l/tap.py.svg
-[shield]: https://img.shields.io/pypi/dm/tap.py.svg
-[travis]: https://img.shields.io/travis/python-tap/tappy/master.svg?label=linux+build
-[travisosx]: https://img.shields.io/travis/python-tap/tappy/master.svg?label=os+x++build
-[appveyor]: https://img.shields.io/appveyor/ci/mblayman/tappy/master.svg?label=windows+build
 [coverage]: https://img.shields.io/codecov/c/github/python-tap/tappy.svg
 [rtd]: http://tappy.readthedocs.io/en/latest/
 [pypi]: https://pypi.python.org/pypi/tap.py
-[stream]: https://github.com/python-tap/tappy/blob/master/docs/images/stream.gif
+[stream]: https://github.com/python-tap/tappy/blob/main/docs/images/stream.gif
 [produce]: http://testanything.org/producers.html
 [consume]: http://testanything.org/consumers.html
 [ns]: https://nose.readthedocs.io/en/latest/

docs/contributing.rst

@@ -41,7 +41,7 @@ Guidelines
 ----------
 
 1. Code uses Black style. Please run it through ``black tap`` to autoformat.
-2. Make sure your change works against master with unit tests.
+2. Make sure your change works against main with unit tests.
 3. Document your change in the ``docs/releases.rst`` file.
 4. For first time contributors, please add your name to ``AUTHORS``
    so you get attribution for you effort.