Set version to 2.0.0 to reflect API major changes

This version of the library will be using v2 of the Odoo Xml Rpc Api and
thus introduce non-backward compatible changes. This calls for a major
version number change.

(cherry picked from commit 52cefc8)

Author: fpoyer

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>com.debortoliwines</groupId>
   <artifactId>odoo-java-api</artifactId>
-  <version>1.5.0</version>
+  <version>2.0.0</version>
   <packaging>jar</packaging>
 
   <name>odoo-java-api</name>