Add __repr__ to wizlight object

[Teraskull]

This PR contains the following changes:

• Add __repr__ to the wizlight object.

This allows for easier debugging when printing out a wizlight object:

>>> print(bulb)

# Before:
<pywizlight.bulb.wizlight object at 0x0000022E89D0C160>

# After:
wizlight(ip="192.168.1.2", port=38899, mac="123456789123")

• Fix typos in the README.

[codecov-commenter]

Codecov Report

Merging #142 (28a9a60) into master (1806dcf) will decrease coverage by 0.09%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
- Coverage   90.96%   90.86%   -0.10%     
==========================================
  Files          12       12              
  Lines         874      876       +2     
==========================================
+ Hits          795      796       +1     
- Misses         79       80       +1     

Impacted Files	Coverage Δ
pywizlight/bulb.py	90.31% <50.00%> (-0.19%)	⬇️

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