build: set version to 1.6.0-SNAPSHOT

Author: javier-godoy

pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>com.flowingcode.vaadin.addons</groupId>
     <artifactId>google-maps</artifactId>
-    <version>1.5.1-SNAPSHOT</version>
+    <version>1.6.0-SNAPSHOT</version>
     <name>Google Maps Addon</name>
     <description>Integration of google-map for Vaadin platform</description>