Fixed some typos and integer division inside of function

[alexmason97]

Hello,

I made some recent modifications to this repo that could be added to the master branch.

Here is a list of the changes:

In file PCA9685.py
a) Fixed a typo for print statement with "Resetting"
b) Fixed a typo for spelling from "Conneceted" to "Connected"
c) Fixed typos in a print statement for the misspelling of "Weird" and changed "Stills" to "Persists"
d) Adjusted the map function to return an integer by typecasting the return value as int to avoid floating-type division for Python3

In the README.md file:
a) Changed to README.md to fix "wa rranty" to "warranty" without the space

Thanks