Revert "update README"

This reverts commit 5670dd6c0107d2ec7364bb7dbe4fccea58589dc8.
Added lab 2 (Web Scraping) to the lab folder and added a link to the lab
in the README.
Merge pull request #5 from PrajitR/lab2

Added Lab 2 (Web Scraping)
Updated readmes
Update lab3.ipynb

Fix typo
Typo
Update statistical graphics gallery.

Remove a redundant import
Update a dead URL
Show a missing bar
Add references to seaborn, prettyplotlib
Merge pull request #1 from cs109/master

Update from original