Updated changelog to address removal of ansi.FG_COLORS and ansi.BG_COLORS and mention their replacement by ansi.fg and ansi.bg enums

Also:
- Use ansi.fg in async_printing.py and README.md

Author: tleonhardt

CHANGELOG.md

@@ -18,6 +18,8 @@
           Settable instance in order to be called
         * **set** command now supports tab-completion of values
     * Removed `cast()` utility function
+    * Removed `ansi.FG_COLORS` and `ansi.BG_COLORS` dictionaries
+        * Replaced with `ansi.fg` and `ansi.bg` enums providing similar but improved functionality
 
 ## 0.9.25 (January 26, 2020)
 * Enhancements

README.md

@@ -91,7 +91,7 @@ Instructions for implementing each feature follow.
     class MyApp(cmd2.Cmd):
         def do_foo(self, args):
             """This docstring is the built-in help for the foo command."""
-            self.poutput(cmd2.style('foo bar baz', fg='red'))
+            self.poutput(cmd2.style('foo bar baz', fg=cmd2.fg.red))
     ```
     - By default the docstring for your **do_foo** method is the help for the **foo** command
         - NOTE: This doesn't apply if you use one of the `argparse` decorators mentioned below

examples/async_printing.py

@@ -10,7 +10,7 @@
 from typing import List
 
 import cmd2
-from cmd2 import ansi
+from cmd2 import style, fg
 
 ALERTS = ["Watch as this application prints alerts and updates the prompt",
           "This will only happen when the prompt is present",
@@ -145,20 +145,20 @@ def _generate_colored_prompt(self) -> str:
         """
         rand_num = random.randint(1, 20)
 
-        status_color = 'reset'
+        status_color = fg.reset
 
         if rand_num == 1:
-            status_color = 'bright_red'
+            status_color = fg.bright_red
         elif rand_num == 2:
-            status_color = 'bright_yellow'
+            status_color = fg.bright_yellow
         elif rand_num == 3:
-            status_color = 'cyan'
+            status_color = fg.cyan
         elif rand_num == 4:
-            status_color = 'bright_green'
+            status_color = fg.bright_green
         elif rand_num == 5:
-            status_color = 'bright_blue'
+            status_color = fg.bright_blue
 
-        return ansi.style(self.visible_prompt, fg=status_color)
+        return style(self.visible_prompt, fg=status_color)
 
     def _alerter_thread_func(self) -> None:
         """ Prints alerts and updates the prompt any time the prompt is showing """