Bump to 1.4.0 (#25)

Signed-off-by: Etienne Homer <[email protected]>

Author: etiennehomer

pom.xml

@@ -20,7 +20,7 @@
     </parent>
 
     <artifactId>powsybl-ws-commons</artifactId>
-    <version>1.4.0-SNAPSHOT</version>
+    <version>1.4.0</version>
     <name>powsybl ws commons</name>
     <description>Powsybl WS commons</description>