use full version number in deprecation note

less/variables.less

@@ -257,7 +257,7 @@
 //## Define the breakpoints at which your layout will change, adapting to different screen sizes.
 
 // Extra small screen / phone
-// Note: Deprecated @screen-xs and @screen-phone as of v3.0.1, and @screen-xs-min as of v3.2
+// Note: Deprecated @screen-xs and @screen-phone as of v3.0.1, and @screen-xs-min as of v3.2.0
 @screen-xs:                  480px;
 @screen-xs-min:              @screen-xs;
 @screen-phone:               @screen-xs-min;