Feature request: option for installing from an existing requirements.txt file
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As mentioned in #12, I have been using your pyvan library to build a stand-alone python application, for which pyvan has helped greatly to achieve the goal. However, in my project there is already a requirements.txt file at the root, I noticed that your script currently overrides during the build. Would it be possible to provide an option to use an existing requirements.txt instead?
I know that as a workaround I could parse the lines of the existing requirements.txt file and provide them line by line to the OPTIONS["install_only_these_modules"], which would technically achieve the same thing. But I think that it is cleaner to provide an explicit option for providing a requirements.txt file explicitly.
If you agree and it is not too much work I could make a PR for this.
It uses pip freeze and pipreqs to gather automatically the modules needed.
An option "install_requirements": True would be nice.
A PR would be appreciated.