requirements.txt (Python) parser doesn't support ~= syntax

[evgfilim1]

What this syntax means

A compatible release clause consists of the compatible release operator ~= and a version identifier. It matches any candidate version that is expected to be compatible with the specified version.

For a given release identifier V.N, the compatible release clause is approximately equivalent to the pair of comparison clauses: >= V.N, == V.*
For example, the following groups of version clauses are equivalent:

~= 2.2
>= 2.2, == 2.*


~= 1.4.5
>= 1.4.5, == 1.4.*

More: PEP 440

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