Update dependencies, remove Ruby <2.3 support

- Version bump to 6.0.0 due to Ruby support change
- Updated 'addressable' and 'rake' gems

Squashed commit of the following:

commit 95e4873
Author: Mark Percival <m@mdp.im>
Date:   Thu Apr 23 15:35:15 2020 +0000

    Update Changelog about travis ruby addition

commit f252777
Author: Mark Percival <m@mdp.im>
Date:   Wed Apr 22 17:47:03 2020 +0000

    Major bump

commit 191ef03
Author: Mark Percival <m@mdp.im>
Date:   Wed Apr 22 17:35:50 2020 +0000

    Add back in 2.3

    2.3 has been EOL'd, but it still compatible with this gems dependencies

commit bafe8bf
Author: Mark Percival <m@mdp.im>
Date:   Wed Apr 22 17:12:59 2020 +0000

    Remove Travis ruby test for 2.0

commit 0919196
Author: Mark Percival <m@mdp.im>
Date:   Wed Apr 22 17:08:45 2020 +0000

    Frozen string fix, updated deps, ruby deprecation

    - Fix issue when using --enable-frozen-string-literal Ruby option #95
      (jeremyevans)
    - Update gems (rake, addressable)
      - Updated gems removes support for Ruby <2.5. Seeing as 2.3 is now
        longer getting security patches, this seems like a non-issue

.travis.yml

@@ -1,8 +1,9 @@
 language: ruby
 before_install: gem install bundler -v '<2'
 rvm:
+  - 2.7
   - 2.6
   - 2.5
-  - 2.0
+  - 2.3
 script:
   - bundle exec rspec

CHANGELOG.md

@@ -1,5 +1,12 @@
 ### Changelog
 
+### 6.0.0
+
+- Dropping support for Ruby <2.3 (Major version bump)
+- Fix issue when using --enable-frozen-string-literal Ruby option #95 (jeremyevans)
+- Update gems (rake, addressable)
+- Update Travis tests to include Ruby 2.7
+
 ### 5.1.0
 
 - Create `random_base32` to perform `random` to avoid breaking changes

Dockerfile-2.3

@@ -0,0 +1,10 @@
+FROM ruby:2.3
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+COPY Gemfile /usr/src/app/
+COPY . /usr/src/app
+RUN bundle install
+
+CMD ["bundle", "exec", "rspec"]

Dockerfile-2.0 → Dockerfile-2.7

@@ -1,4 +1,4 @@
-FROM ruby:2.0
+FROM ruby:2.7
 
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app

lib/rotp/version.rb

@@ -1,3 +1,3 @@
 module ROTP
-  VERSION = '5.1.0'.freeze
+  VERSION = '6.0.0'.freeze
 end

rotp.gemspec

@@ -4,6 +4,7 @@ Gem::Specification.new do |s|
   s.name        = 'rotp'
   s.version     = ROTP::VERSION
   s.platform    = Gem::Platform::RUBY
+  s.required_ruby_version = '~> 2.3'
   s.license     = 'MIT'
   s.authors     = ['Mark Percival']
   s.email       = ['mark@markpercival.us']
@@ -16,9 +17,9 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
   s.require_paths = ['lib']
 
-  s.add_runtime_dependency 'addressable', '~> 2.5'
+  s.add_runtime_dependency 'addressable', '~> 2.7'
 
-  s.add_development_dependency 'rake', '~> 10.5'
+  s.add_development_dependency "rake", "~> 13.0"
   s.add_development_dependency 'rspec', '~> 3.5'
   s.add_development_dependency 'simplecov', '~> 0.12'
   s.add_development_dependency 'timecop', '~> 0.8'