min ruby version 2.5

Author: MarioRuiz

.travis.yml

@@ -1,6 +1,5 @@
 language: ruby
 rvm:
-  - 2.4
   - 2.5
   - 2.6
   - 2.7

open_api_import.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.test_files    = s.files.grep(%r{^(test|spec|features)/})
   s.require_paths = ["lib"]
   s.executables << 'open_api_import'
-  s.required_ruby_version = '>= 2.4'
+  s.required_ruby_version = '>= 2.5'
   s.post_install_message = "Thanks for installing! Visit us on https://github.com/MarioRuiz/open_api_import"
 end