Chagning version to 1.2.12 (#347)

Author: yvgopal

pom.xml

@@ -13,7 +13,7 @@
 		<proton-j-version>0.31.0</proton-j-version>
 	  	<junit-version>4.12</junit-version>
 		<slf4j-version>1.7.0</slf4j-version>
-		<client-current-version>1.2.11</client-current-version>		
+		<client-current-version>1.2.12</client-current-version>		
 	</properties>
 
 	<modules>