Migrated to latest gRPC and Protobuf version

Author: kaiwaehner

pom.xml

@@ -31,8 +31,8 @@
 <properties>
 <exec.mainClass>
 com.github.megachucky.kafka.streams.machinelearning.Kafka_Streams_TensorFlow_Serving_gRPC_Example</exec.mainClass>
-<grpc.version>1.6.1</grpc.version>
-<protobuf.version>3.0.0-beta-3</protobuf.version>
+<grpc.version>1.13.1</grpc.version>
+<protobuf.version>3.6.0</protobuf.version>
 <tika.version>1.14-SNAPSHOT</tika.version>
 <slf4j.version>1.7.12</slf4j.version>
 <java.version>1.8</java.version>