CHANGELOG.md: Add mioDAQ configurable digital voltage (#663)

Author: bkeryan

CHANGELOG.md

@@ -29,6 +29,9 @@ All notable changes to this project will be documented in this file.
 * ### Resolved Issues
     * ...
 
+* ### Major Changes
+    * Added support for mioDAQ configurable digital voltage.
+
 * ### Known Issues
     * ...
 
@@ -269,4 +272,4 @@ All notable changes to this project will be documented in this file.
     readthedocs.
 
 ## 0.5.0
-* Initial pre-release of nidaqmx
+* Initial pre-release of nidaqmx