Fixed the Making API Calls link.

Author: gmessner

README.md

@@ -22,7 +22,7 @@ GitLab4J™ API (gitlab4j-api) provides a full featured and easy to consume
     * [Lazy evaluation example usage](#lazy%20evaluation-example-usage)<br/>
   * [Java 8 Optional&lt;T&gt; Support](#java-8-optional-support)<br/>
   * [Issue Time Estimates](#issue-time-estimates)<br/>
-* [Making API Calls](#making-pi-calls)<br/>
+* [Making API Calls](#making-api-calls)<br/>
   * [Available Sub APIs](#available-sub-apis)
 
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