Formatting and wording changes for Lesson 4 README

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###Please consider the following changes for the Lesson 4 README. Please let me know if I should submit a pull request.

OOP Implementation Using Python

TASK 1:

Refer to the web site for information about the Python turtle module. Study about Class implementation from given repository resources and write a python script for making an animation of multiple squares deviating at an angle to form a circle.

Assistance:

• The Python Standard Library has a module called turtle.
• The turtle module has a class called Turtle.
• Calling turtle.Turtle() instantiates the class.
• Refer to the web site for turtle documentation.
• Check on Resources to get the solution.

TASK 2:

Using the Twilio python module (which is not a part of the Standard Python Library), write a python script that can send a message to a phone number. Study about Twilio and python usage from the Internet.

(Messages from a small piece of code?? Interesting!)

Assistance:

• Study the 'twilio' module.
• A Twilio account is needed to use the API.
• Be careful about Auth Tokens.
• Refer to the web site for complete documentation of the twilio module.
• Check on Resources to get the solution.

About Used Modules:

• https://www.twilio.com/docs/libraries/python
• https://docs.python.org/2/library/turtle.html