cut 2.8.0 release

Signed-off-by: Matthew Peveler <matt.peveler@gmail.com>

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## Version 2.8.0
+
+*October 27, 2020*
+
+* Remove last trailing newline when using the copy code button
+* Rework docker image and make available at slatedocs/slate
+* Improve Dockerfile layout to improve caching (thanks @micvbang)
+* Bump rouge from 3.20 to 3.24
+* Bump nokogiri from 1.10.9 to 1.10.10
+* Bump middleman from 4.3.8 to 4.3.11
+* Bump lunr.js from 2.3.8 to 2.3.9
+
 ## Version 2.7.1
 
 *August 13, 2020*