README.md in rbnacl-6.0.1 vs README.md in rbnacl-7.0.0

@@ -57,13 +57,13 @@
 You can use RbNaCl on platforms libsodium is supported (see below).
 
 This library aims to support and is [tested against][travis] the following Ruby
 versions:
 
-* Ruby 2.2
 * Ruby 2.3
 * Ruby 2.4
 * Ruby 2.5
+* Ruby 2.6
 * JRuby 9.1
 
 If something doesn't work on one of these versions, it's a bug.
 
 [travis]: http://travis-ci.org/crypto-rb/rbnacl