Fixed issue #201 (Installation Error #201) (change syft==0.4.0 to syft==0.3.0 in setup.py)

[karynaur]

Description

Fixing a small bug in setup.py. python setup.py install was giving an error "error: Could not find suitable distribution for Requirement.parse('syft==0.4.0')", which was due to the incorrect version of syft. The issue has been solved by mentioning the latest version of syft i.e. 0.3.0 as of here. This PR solves Installation Error #201.

How has this been tested?

• The installation process was tested on colab which can be found here

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the OpenMined Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests