Update README to use virtualenv while installing on Linux #237

[za]

Issue #237

Because by using virtualenv, we can have Loki installed on an independent Python environment.

[za]

Hi @Neo23x0 thanks for merging it.

Do you mind tag/label this PR as hacktoberfest project? https://hacktoberfest.com/participation/

[Neo23x0]

Yes

[za]

@Neo23x0 Thanks 🚀