Corrected section on Java 8 Optional<T> support.

Author: gmessner

README.md

@@ -95,7 +95,7 @@ while (projectsPager.hasNext())) {
 ```
 ---
 ## Java 8 Optional<T> Support
-GitLab4J-API supports Java 8 Optional<T> for API calls that result in the return of a single item. Here are a couple of examples on how to use the Java 8 Optional<T> API calls:
+GitLab4J-API supports Java 8 Optional<T> for API calls that result in the return of a single item. Here is an example on how to use the Java 8 Optional<T> API calls:
 ```java
 Optional<Group> optionalGroup =  gitlabApi.getGroupApi().getGroup("my-group-path");
 if (optionalGroup.isPresent())