travis: drop 2.3 as well

.travis.yml

@@ -8,10 +8,9 @@ addons:
     packages:
       - libgirepository1.0-dev # for gobject-introspection
 rvm:
-  - 2.3.3
-  - 2.4.1
   - 2.4.2
   - 2.5.0
+  - 2.6.0
   - ruby-head
 matrix:
   allow_failures:

CHANGELOG.md

@@ -22,6 +22,7 @@ Chores:
 
 Compatibility:
 * A LOT more pre-defined colors built into Cairo. Some of the named colors got redefined with the upgrade to the latest Cairo. This means that named colors like `:gray` and `:green` may look slightly different.
+* Dropped support for EOL'd Rubies. Minimum support is 2.4
 
 Special thanks to @lcarlsen, @Karneades
 

README.md

@@ -31,7 +31,7 @@ Wanna see more? Check out the website: http://andymeneely.github.io/squib/
 
 ## Installation
 
-Squib requires Ruby 2.2 or later.
+Squib requires Ruby 2.3 or later.
 
 Install it yourself with: