Revert "Update 'README.md'"

This reverts commit 4897ebe5a7855471bb89feaabef238e8a155d85f.

README.md

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 * **Purpose**
 	* To demonstrate practical understanding of arrays, loops, and basic composition.
 * **Instructions**
-    * The `IntegerDuplicateDeleter` and `StringDuplicateDeleter` both inherit from the abstract class `DuplicateDeleter`. The `DuplicateDeleter` class has two required methods that the IntegerDuplicateDeleter and StringDuplicateDeleter need to implement. You need to add the two methods into the two classes and add a constructor to call the `DuplicateDeleter` method to make your code compile.
     * Given an object, `IntegerDuplicateDeleter`, with a composite `Integer[]` object, write a method
         * `removeDuplicatesExactly` which removes all values in the array which occur exactly the specified number of times.
         * `removeDuplicates` which removes all values in the array which occur at least the specified number of times.