Formatting and wording changes for Lesson 4 README

###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](https://docs.python.org/2/library/turtle.html) 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](https://www.twilio.com/docs/libraries/python) 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://www.twilio.com/docs/libraries/python)
* [https://docs.python.org/2/library/turtle.html](https://docs.python.org/2/library/turtle.html)