Added PyPi installation instructions

Author: evaherrada

README.rst

@@ -26,7 +26,7 @@ Please ensure all dependencies are available on the CircuitPython filesystem.
 This is easily achieved by downloading `the Adafruit library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.
 
 Installing from PyPI
---------------------
+====================
 
 On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
 PyPI <https://pypi.org/project/adafruit-circuitpython-tinylora/>`_. To install for current user: