Add pycurl to one of dependencies in README.md

[elogada]

I tried installing the JSParser straight out of the box as per README.md's requirements. Although I am met with problems, I still managed to fix them.

The (main) problem was that in the box that I was using, pycurl had not been included yet. Whether this is a side-effect of Python2.7's deprecation in 2020 is out of my reach, however, simply installing pycurl managed to do the job.

The syntax for this hotfix is

pip install pycurl

In the event that one is met with more errors, a significant help would be to install libgnutls* packages from one's repository. In that case, the fix would be dependent on your default-installation and what you can get from your repo.

Tl;dr
Add pycurl as a dependency in the Readme file.