Set minimum Ruby version to 2.6.0 and enable MFA

Author: blocknotes

administrate-materialize-theme.gemspec

@@ -16,14 +16,11 @@ Gem::Specification.new do |spec|
   spec.description = "A Material Design theme for Administrate using Materialize framework"
   spec.license     = "MIT"
 
-  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
-  # to allow pushing to a single host or delete this section to allow pushing to any host.
-  if spec.respond_to?(:metadata)
-    # spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"
-  else
-    raise "RubyGems 2.0 or newer is required to protect against " \
-      "public gem pushes."
-  end
+  spec.required_ruby_version = '>= 2.6.0'
+
+  spec.metadata['homepage_uri']          = spec.homepage
+  spec.metadata['source_code_uri']       = spec.homepage
+  spec.metadata['rubygems_mfa_required'] = 'true'
 
   spec.files = Dir["{app,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]