Changed code to use the 'open()' context manager. release-3.1.0

Created global tag <release-3.0.0>.

Removed support for Python2. release-3.0.0

Updated copyright for 2020.

Created global tag <release-2.1.3>.

bug fixes release-2.1.3

Updated copyright for 2019.

Updated copyright for 2018.

Created global tag <release-2.1.2>.

Fixed some code style issues. release-2.1.2

(0) -10 +10 tip

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