Bump version to 3.1.1-SNAPSHOT.

Change-Id: I2f31564c39e8281ad53080199c12d9cb348e2089
diff --git a/runtime/pom.xml b/runtime/pom.xml
index 37b8bc1..6dfdcb9 100644
--- a/runtime/pom.xml
+++ b/runtime/pom.xml
@@ -7,7 +7,7 @@
   <parent>
     <groupId>eu.mulk.quarkus-googlecloud-jsonlogging</groupId>
     <artifactId>quarkus-googlecloud-jsonlogging-parent</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
   </parent>
 
   <artifactId>quarkus-googlecloud-jsonlogging</artifactId>