Cleans up macro code, fixes example usage, fixes minor typos and adds linting to comply with official PEP-8 standards #84
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In addition to fixing the minor bugs, I had already fixed the formatting issues from my previous pull request and cleaned up the implementation.
In addition to these changes, I also used linting tools to make checker_3.py PEP-8 compliant, which is the official Python 3 formatting standard defined by Guido van Rossum himself. Although it was unsolicited, implementing this standard helps make it both easier to and more likely that others will contribute!
Note: make sure the screen has sufficient width when comparing the utility title macro/release version banner and the notice/disclaimer banner that displays upon successful scans.