Convert README to reStructuredText

It's the preferred format for Python, after all.

README.md → README.rst

-# pd-buddy-python
+pd-buddy-python
+===============
 
-Python library for working with the PD Buddy Sink Serial Console Configuration
-Interface
+Python library for working with the PD Buddy Sink Serial Console
+Configuration Interface
 
-## Features
+Features
+--------
 
-* Provides a Pythonic interface to the PD Buddy Sink shell commands
-* Configuration is represented as a SinkConfig object
-* SinkConfig objects can be manipulated locally and written to the device with
-  one method call
+-  Provides a Pythonic interface to the PD Buddy Sink shell commands
+-  Configuration is represented as a SinkConfig object
+-  SinkConfig objects can be manipulated locally and written to the
+   device with one method call
 
-## Examples
+Examples
+--------
 
-### Open the first PD Buddy Sink device and read its configuration
+Open the first PD Buddy Sink device and read its configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
 
     >>> import pdbuddy
     >>> pdbs = pdbuddy.Sink(list(pdbuddy.Sink.get_devices())[0])
     v: 5.00 V
     i: 3.00 A
 
-### Locally manipulate a SinkConfig object
+Locally manipulate a SinkConfig object
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
 
     >>> cfg = pdbs.get_cfg()
     >>> cfg.v = 20000
     >>> cfg
     SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.GIVEBACK, v=20000, i=2250)
 
-### Write the SinkConfig object to flash
+Write the SinkConfig object to flash
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
 
     >>> pdbs.set_tmpcfg(cfg)
     >>> pdbs.write()
     >>> pdbs.get_cfg()
     SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.GIVEBACK, v=20000, i=2250)
 
-## Requirements
+Requirements
+------------
 
-* Python >= 3.6
-* pySerial >= 3.0
+-  Python >= 3.6
+-  pySerial >= 3.0