Update README.md

Author: ramsessanchez

README.md

@@ -19,7 +19,7 @@ repositories {
 
 dependencies {
     // Include the sdk as a dependency
-    implementation 'com.microsoft.graph:microsoft-graph:5.20.0'
+    implementation 'com.microsoft.graph:microsoft-graph:5.21.0'
     // Uncomment the line below if you are building an android application
     //implementation 'com.google.guava:guava:30.1.1-android'
     // This dependency is only needed if you are using the TokenCrendentialAuthProvider