Codemod to convert assignments to augmented assignments

:eyes: Some source code analysis tools can help to find opportunities for improving software components.
:thought_balloon: I propose to [increase the usage of augmented assignment statements](https://docs.python.org/3/reference/simple_stmts.html#augmented-assignment-statements "Augmented assignment statements") accordingly.

Would you like to integrate anything from a transformation result which can be generated by a command like the following?
(:point_right: Please check also for questionable change suggestions because of an evolving search pattern.)
```
lokal> perl -p -i.orig -0777 -e 's/^(?\s+)(?\S+)\s*=\s*\k[ \t]*(?[+\-%&|^@]|\*\*?|\/\/?|<<|>>)/$+{indentation}$+{target} $+{operator}=/gm' $(find ~/Aktivitäten/LibCST/lokal -name '*.py')
```

How do you think about to improve nine source code places? :thinking:

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:crystal_ball: How would a corresponding transformation (a “codemod”) be achieved by the means of the software “LibCST”?