Remove Ruby 2.0 support and bump to version 0.7

Ruby 2.0 is far EoL and there's no need to support it as we use 2.1.X in omnibus.

Signed-off-by: Tim Smith <tsmith@chef.io>

.travis.yml

@@ -1,9 +1,8 @@
 sudo: false
 
 rvm:
-  - 2.0
-  - 2.1
-  - 2.2
+  - 2.1.9
+  - 2.2.5
   - 2.3.1
 
 # Don't install local development gems on Travis, use parallel gem downloads

Gemfile

@@ -7,6 +7,6 @@ end
 
 group :test do
   gem 'chef-zero', '~> 2.0.0'
-  gem 'rake',      '~> 10.3'
+  gem 'rake',      '~> 11.0'
   gem 'rspec',     '~> 3.0'
 end

chef-api.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/sethvargo/chef-api'
   spec.license       = 'Apache 2.0'
 
-  spec.required_ruby_version = '>= 2.0'
+  spec.required_ruby_version = '>= 2.1'
 
   spec.files         = `git ls-files`.split($/)
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }

lib/chef-api/version.rb

@@ -1,3 +1,3 @@
 module ChefAPI
-  VERSION = '0.6.0'
+  VERSION = '0.7.0'
 end