Bumped version of gRPC to 1.3.1

Change-Id: I7798476bd443a796e0e6a6e149ab8f66435ba4fa
diff --git a/protocols/p4runtime/proto/BUCK b/protocols/p4runtime/proto/BUCK
index 95fe691..53db8a5 100644
--- a/protocols/p4runtime/proto/BUCK
+++ b/protocols/p4runtime/proto/BUCK
@@ -3,7 +3,7 @@
 )
 
 PROTOBUF_VER = '3.2.0'
-GRPC_VER = '1.3.0'
+GRPC_VER = '1.3.1'
 
 PI_COMMIT = '13d611a9c655938676ebcde2bd5653b461f46ca7'
 PI_BASEURL = 'https://github.com/p4lang/PI.git'
diff --git a/protocols/p4runtime/proto/pom.xml b/protocols/p4runtime/proto/pom.xml
index f07728e..774ebb5 100644
--- a/protocols/p4runtime/proto/pom.xml
+++ b/protocols/p4runtime/proto/pom.xml
@@ -179,7 +179,7 @@
             <!--<plugin>-->
                 <!--<groupId>com.googlecode.maven-download-plugin</groupId>-->
                 <!--<artifactId>download-maven-plugin</artifactId>-->
-                <!--<version>1.3.0</version>-->
+                <!--<version>1.3.1</version>-->
                 <!--<executions>-->
                     <!--<execution>-->
                         <!--<id>install-any</id>-->