Update VERSION - release branch v2.0 (#354)

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---

_High level summary of changes. Try to keep this as short and
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_Describe your changes. You can be more detailed and descriptive here.
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## Summary
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informative as possible: less is more._

## Details
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## Usage
_How does a user interact with the changed code?_
```python
python -m your.new.module -and -all -options
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## Testing
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pytest -v tests/your/new/or/existing/test_functions.py::test_function
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**Most of the changes** to files with extensions `*.py`, `*.yaml`,
`*.yml`, `Dockerfile*` or `requirements.txt` **DO REQUIRE both `pytest-`
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before asking for review?
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Signed-off-by: Dorota Toczydlowska <[email protected]>

VERSION

@@ -1 +1 @@
-2.0.0
+2.0