File-read-backwards

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* Officially support Python 3.7 - 3.11.

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Mimicing Python file object behavior.

* FileReadBackwards no longer creates multiple iterators (a change of behavior from 1.x.y version)
* Adding readline() function retuns one line at a time with a trailing new line and empty string when it reaches end of file.
The fine print: the trailing new line will be `os.linesep` (rather than whichever new line type in the file).

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* Re-release of 1.2.1 for ease of updating pypi page for updated travis & pyup.

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* Made doc strings consistent to Google style and some code linting

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* Include context manager style as it provides cleaner/automatic close functionality

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* Documentation re-arrangement. Usage examples are now in README.rst
* Minor refactoring