Upgraded API compatibility level to 5.1
diff --git a/pom.xml b/pom.xml
index 58299b3..1fbf1f7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -77,7 +77,7 @@
     <slf4j.version>1.7.25</slf4j.version>
     <log4j.version>2.8.2</log4j.version>
     <rxjava.version>2.2.8</rxjava.version>
-    <api.comparison.version>5.0</api.comparison.version>
+    <api.comparison.version>5.1</api.comparison.version>
   </properties>
 
   <dependencyManagement>