Updated CHANGELOG to prepare for next release

Also:
- Upated README to reflect this will be the last release to support Python 3.5

Author: tleonhardt

CHANGELOG.md

@@ -1,4 +1,4 @@
-## 1.4.1 (TBD, 2020)
+## 1.5.0 (January 31, 2021)
 * Bug Fixes
     * Fixed bug where setting `always_show_hint=True` did not show a hint when completing `Settables`
     * Fixed bug in editor detection logic on Linux systems that do not have `which`
@@ -7,7 +7,9 @@
 * Enhancements
     * Added `silent_startup_script` option to `cmd2.Cmd.__init__()`. If `True`, then the startup script's
       output will be suppressed. Anything written to stderr will still display.
-    * cmd2 now uses pyreadline3 when running Python 3.8 or greater on Windows  
+    * cmd2 now uses pyreadline3 when running Python 3.8 or greater on Windows
+* Notes
+    * This is the last release planned to support Python 3.5
 
 ## 1.4.0 (November 11, 2020)
 * Bug Fixes

README.md

@@ -45,13 +45,15 @@ Main Features
 - Alerts that seamlessly print while user enters text at prompt
 - Colored and stylized output using `ansi.style()`
 
-Python 3.5 support ending soon
-------------------------------
-`cmd2` will end support for Python 3.5 on August 31, 2020.  Python 3.5 was [released](https://docs.python.org/3/whatsnew/3.5.html)
-on Sept. 13, 2015 and its [end-of-life](https://devguide.python.org/#status-of-python-branches) is planned for September 2020. 
-
-New versions of `cmd2` will stop supporting Python 3.5 in a few months. We are very much looking forward to being able to use 
-[features added in Python 3.6](https://docs.python.org/3/whatsnew/3.6.html) such as [f-strings](https://realpython.com/python-f-strings/).
+Python 3.5 support ended
+------------------------
+The last release of `cmd2` to support Python 3.5 was the 1.5.0 release on January 31, 2021.  Python 3.5 was 
+[released](https://docs.python.org/3/whatsnew/3.5.html) on Sept. 13, 2015 and it reached
+[end-of-life](https://devguide.python.org/#status-of-python-branches) on September 5, 2020. 
+
+We are very much looking forward to being able to use 
+[features added in Python 3.6](https://docs.python.org/3/whatsnew/3.6.html) such as 
+[f-strings](https://realpython.com/python-f-strings/).
 
 Installation
 ------------