chore(pom): update api version

Author: Jiankai Zheng

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>nl.jiankai</groupId>
     <artifactId>spotify-web-api-wrapper</artifactId>
-    <version>1.3.0</version>
+    <version>1.4.0</version>
 
     <name>Spotify Web API Java Wrapper</name>
     <description>A Java Wrapper for Spotify's Web API</description>