Added version release notes

CHANGES.adoc

@@ -1,5 +1,16 @@
 = Changes
 
+== 8.1.0 (2020-04-01)
+
+- Added README production and development setup instructions
+- Updated Circle CI build label
+- Updated README screencast to use larger image
+- Updated documentation to ASCII Doc format
+- Updated to Code of Conduct 2.0.0
+- Updated to Git Cop 4.0.0
+- Updated to Ruby 2.7.1
+- Removed README images
+
 == 8.0.1 (2020-01-01)
 
 * Added Startup Security Utility to README.

README.adoc

@@ -59,7 +59,7 @@ To install, run:
 ----
 git clone https://github.com/bkuhlmann/mac_os.git
 cd mac_os
-git checkout 8.0.1
+git checkout 8.1.0
 ----
 
 === Development