Changes from Release 2.3.1 — SimPy 2.3.1 documentation

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# Changes from Release 2.3.1

This section addresses the difference between previous SimPy version 2.1.0 and 2.3.1 in terms of changes and additions.

## Changes from 2.1.0 to 2.2.b1

- The Unit tests have been rewritten
- The directory sturcture of the release has been simplified
- The documentation has had some minor changes

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