We now require Ruby 2.4 or greater.

Also, removed the obsolete gemnasium check.

Author: evolve75

.travis.yml

@@ -7,9 +7,9 @@ before_install:
 bundler_args: --without development
 
 rvm:
-  - 2.2.9
-  - 2.3.6
-  - 2.4.3
+  - 2.4
+  - 2.5
+  - 2.6
 
 matrix:
   allow_failures:

README.md

@@ -1,14 +1,13 @@
 <!--
   README.md
 
-  Copyright (C) 2006-2017 Anupam Sengupta (anupamsg@gmail.com)
+  Copyright (C) 2006-2017, 2020 Anupam Sengupta (anupamsg@gmail.com)
 
 -->
 # **RubyTree** #
 
 [![Gem Version](https://badge.fury.io/rb/rubytree.png)](http://badge.fury.io/rb/rubytree)
 [![Travis Build Status](https://secure.travis-ci.org/evolve75/RubyTree.png)](http://travis-ci.org/evolve75/rubytree)
-[![Dependency Status](https://gemnasium.com/evolve75/RubyTree.png)](https://gemnasium.com/evolve75/RubyTree)
 [![Code Climate](https://codeclimate.com/github/evolve75/RubyTree.png)](https://codeclimate.com/github/evolve75/RubyTree)
 [![Coverage Status](https://coveralls.io/repos/evolve75/RubyTree/badge.png)](https://coveralls.io/r/evolve75/RubyTree)
 

rubytree.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   s.email                 = 'anupamsg@gmail.com'
   s.homepage              = 'http://rubytree.anupamsg.me'
 
-  s.required_ruby_version = '>=2.3'
+  s.required_ruby_version = '>=2.4'
 
   s.summary               = %q{A generic tree data structure.}
   s.description           = <<-EOF