update release version to 4.0.0 and fix zappr errors

Author: Chanaka Balasooriya

.zappr.yaml

@@ -6,3 +6,4 @@ approvals:
       - zalando
       - zalando-stups
     collaborators: true
+X-Zalando-Team: acid

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.zalando</groupId>
     <artifactId>zalando-sprocwrapper</artifactId>
-    <version>3.2.2-SNAPSHOT</version>
+    <version>4.0.0-SNAPSHOT</version>
 
     <name>Stored Procedure Wrapper</name>
     <description>Library to make PostgreSQL stored procedures available through simple Java "*SProcService" interfaces