increment version to 2.1

Version needs to be incremented for development on next snapshot release. [ci skip]

Author: André Behrens

pom.xml

@@ -31,7 +31,7 @@
     <groupId>com.microsoft.ews-java-api</groupId>
     <artifactId>ews-java-api</artifactId>
 
-    <version>2.0-SNAPSHOT</version>
+    <version>2.1-SNAPSHOT</version>
 
     <name>Exchange Web Services Java API</name>
     <description>Exchange Web Services (EWS) Java API</description>