Set next version to 5.2.0-SNAPSHOT

Author: vietj

pom.xml

@@ -24,7 +24,7 @@
   </parent>
 
   <artifactId>vertx-openapi</artifactId>
-  <version>5.1.1-SNAPSHOT</version>
+  <version>5.2.0-SNAPSHOT</version>
 
   <name>Vert.x OpenAPI</name>