matlab.engine versions are not standard for Python packages

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Using a version of, e.g. "R2018a" is not a standard version number that meets the Pep requirements for python packaging, and as a result causes issues with some programs that assume the standards are being met.

I suggest switching to a semver approach, such as "2018.1.x" for R2018A and "2018.2.x" for R2018B. This allows for proper versioning of bugfix releases as well, similar to the release versions of the major Matlab versions (i.e. R2019a release 8, etc.). Currently, the Poetry dependency manager for Python chokes on matlab.engine versions as a result after installation.

Note: This was after installing from matlabroot/extern/engines/python directly, the pip install method may be different.