Pydeequ __version__ is not updated for recent versions

[antoniopelias]

Describe the bug
When accessing the module level dunder attribute in the recent pydeequ versions __version__ we get an old version.

To Reproduce
Steps to reproduce the behavior:

1. Install pydeequ version 1.4.0
2. Run python
3. Import pydeequ and get the version

$ pip install pydeequ==1.4.0
$ python3
>>> import pydeequ
>>> pydeequ.__version__
'1.2.0'

Expected behavior
pydeequ.__version__ should return the same version as the one that was installed, in this case '1.4.0'

Additional context
This is a very easy issue to solve, but has to be done whenever there is a new version of pydeequ.