Replaced unicode escape sequence for horizontal ellipsis with actual character

Author: kmvanbrunt

cmd2/constants.py

@@ -14,7 +14,9 @@
 MULTILINE_TERMINATOR = ';'
 
 LINE_FEED = '\n'
-HORIZONTAL_ELLIPSIS = '\N{HORIZONTAL ELLIPSIS}'
+
+# One character ellipsis
+HORIZONTAL_ELLIPSIS = '…'
 
 DEFAULT_SHORTCUTS = {'?': 'help', '!': 'shell', '@': 'run_script', '@@': '_relative_run_script'}