Update README.md

Author: kazuki43zoo

README.md

@@ -13,7 +13,7 @@ MyBatis FreeMarker Scripting Support.
 Requirements
 ----------
 
-* master(under active development) : Version 1.2.x requires MyBatis 3.5+, FreeMarker 2.3.22+ and Java 8+
+* master(under active development) : Version 1.2.0-SNAPSHOT requires MyBatis 3.5+, FreeMarker 2.3.22+ and Java 8+
 * 1.1.x(latest released line) : Version 1.1.2 requires MyBatis 3.4+, FreeMarker 2.3.22+ and Java 7+