Set minimum ruby version

Signed-off-by: Diogo Tridapalli <[email protected]>

Author: diogot

.travis.yml

@@ -7,7 +7,6 @@ rvm:
   - 2.6.0
   - 2.5.3
   - 2.4.5
-  - 2.3.8
 
 script:
-    - bundle exec rake spec
+    - bundle exec rake spec

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
       method_source (~> 1.0)
     public_suffix (4.0.5)
     rainbow (3.0.0)
-    rake (10.5.0)
+    rake (13.0.1)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -138,7 +138,7 @@ DEPENDENCIES
   guard-rspec (~> 4.7)
   listen (= 3.0.7)
   pry
-  rake (~> 10.0)
+  rake (~> 13.0)
   rspec (~> 3.4)
   rubocop
   yard

danger-xcode_summary.gemspec

@@ -21,11 +21,13 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
+  spec.required_ruby_version = ">= 2.4.0"
+
   spec.add_runtime_dependency 'danger-plugin-api', '~> 1.0'
 
   # General ruby development
   spec.add_development_dependency 'bundler', '~> 1.3'
-  spec.add_development_dependency 'rake', '~> 10.0'
+  spec.add_development_dependency 'rake', '~> 13.0'
 
   #  Testing support
   spec.add_development_dependency 'rspec', '~> 3.4'