Merge pull request #338 from ouertani/java-9

support compile by java 9

pom.xml

@@ -60,7 +60,7 @@
         <curator.version>2.11.0</curator.version>
         <protobuf.version>3.0.2</protobuf.version>
         <grpc.version>1.0.0</grpc.version>
-        <lombok.version>1.16.10</lombok.version>
+        <lombok.version>1.16.18</lombok.version>
         <paho.client.version>1.1.0</paho.client.version>
         <netty.version>4.1.3.Final</netty.version>
         <os-maven-plugin.version>1.5.0</os-maven-plugin.version>