Update Hadoop version

Author: tmielika

pom.xml

@@ -21,7 +21,7 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
 
-        <hadoop_version>2.7.2</hadoop_version>
+        <hadoop_version>2.8.5</hadoop_version>
         <json4s-native.version>3.5.3</json4s-native.version>
         <maven-shade-plugin.version>2.1</maven-shade-plugin.version>
         <maven-surefire-plugin.version>2.20.1</maven-surefire-plugin.version>