Update README.md

README.md

 * Create a `TestInstructors` class.
 
 
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 ### Part 9.1 - Create `ZipCodeWilmington` Class
 * Use `Part 7` as a reference.
 * Create a `ZipCodeWilmington` singleton.
 * You may have noticed that the `findById`, and `hostLecture` methods require an intermediate [casting trick](https://stackoverflow.com/questions/5289393/casting-variables-in-java).
 * To remedy this issue, we can _generify_ the `People` class.
 
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 ### Part 10.1 - Modify `People` class
 * [Parameterize](https://stackoverflow.com/questions/12551674/what-is-meant-by-parameterized-type) the `People` signature to enforce that it is a container for objects of type `E` such that `E` is a subclass of `Person`.
 * Modify `people` field to enforce that is a container of objects of type `E`.
 * Modify the `getArray` method to ensure that it returns an object of type `E[]`.
 * Modify the `findById` method to ensure that it returns an object of type `E`.
 
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 ### Part 10.2 - Modify `People` subclasses
 * Modify the `Students` class signature to ensure that it is a subclass of `People` of parameterized type `Student`.
 * Modify the `Instructors` class signature to ensure that it is a subclass of `People` of parameterized type `Instructor`.
 
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 ### Part 10.3 - Refactor `ZipCodeWilmington` class
 * Refactor the `hostLecture` method in the `ZipCodeWilmington` class by removing any intermediate _casting trick(s)_.
 
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 ### Part 10.0 - Test refactored classes.
 * Ensure that the `TestStudents`, `TestInstructors`, `TestPeople`, `TestZipCodeWilmington` classes were no affected by the refactor.
 
 Additionally, it's challenging to ensure **every** `Person` instance has a unique ID amongst its respective `People` subclass.<br>
 To remedy this issue, we redesign and refactor.
 
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 ### Part 11.1 - Create `Educator` enum
 * Create an enum named `Educator`.
 	* The enum should implement `Teacher`.
 	* The enum should have an enumeration for each of the instructors represented in the `Instructors` class.
 	* The enum should have an _empty nullary constructor_.
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 ### Part 11.0 - Test `Educator`
 * Use `Part 5` as a reference.
 
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 ### Part 12.1 - Modify `Instructor` Class
 * Annotate the constructor with `@Deprecated`.
 * This constructor should be commented with `//TODO - Remove dependencies`
 * Remove any calls being made to the deprecated construcor.
 * Remove the deprecated constructor from the class.
 
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 ### Part 12.0 - Test `Instructor`
 * Refactor `TestInstructor` to support the newly created `Instructor` constructor.
 * Ensure the tests were not affected by the refactoring.