Chaospy

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CHANGED:
* Update packages and installation method to full pyproject.

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FIXED:
* Correct scaling of Trunc-normal distribution.

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FIXED:
* Use weakref to reduce bloat.

==========================

FIXED:
* conditional variables `x` in `E[P | x]` now enforced to be ordered correctly.

==========================

CHANGED:
* Switch scipy backend of TruncNormal.

==========================

CHANGED:
* Replaced poetry with native pip.
* Testing with CircleCI replaced with Github action.
* Remove assert check.

REMOVED:
* Python2 testing.