Update README according to "Fix JS jQuery "on" snippet"

This updates README.md file according to commit
721d44aa0cc0840667c8e379c698b37cfd9895b0.
Update README according to "Add more JS snippets"

This updates README.md file according to commit
19a07169158693af07c20af178b315da10af2fdc.
Update README according to "Add "should" to Ruby Rspec "its" snippet"

This updates README.md file according to commit
7d7355b6ad56095815b00a57e1c9be0afa86c70e.