Updated change log

Author: kmvanbrunt

CHANGELOG.md

@@ -3,6 +3,8 @@
     * Fixed bug where a redefined `ansi.style_error` was not being used in all `cmd2` files
 * Enhancements
     * Enabled line buffering when redirecting output to a file
+    * Added `ljustify_text()`, `center_text()`, and `rjustify_text()` to utils.py. All 3 of these functions support
+    ANSI escape sequences and characters with display widths greater than 1.
 
 ## 0.9.21 (November 26, 2019)
 * Bug Fixes