Issue related due to deadlock in Web Crawling resolved and Readme modified.

[SohailAlvi]

Changes this pull request makes :

issue #3 and #13 lib/crawler modules have been modified to suit codacy standards. Readme.md updated

Checklist :

• [ ] I have added the relevant documentation.
• [x] My branch is up-to-date with the upstream master branch.
• [x] I have fully tested the changes locally.

Development environment

OS: Ubuntu 18.04
Python Version: 3.5.2