Update dry-matcher.gemspec

Source file https://github.com/dry-rb/template-gem/blob/HEAD/gemspec.erb

Author: File Sync

dry-matcher.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.metadata["source_code_uri"]   = "https://github.com/dry-rb/dry-matcher"
   spec.metadata["bug_tracker_uri"]   = "https://github.com/dry-rb/dry-matcher/issues"
 
-  spec.required_ruby_version = ">= 3.0.0"
+  spec.required_ruby_version = "2.7"
 
   # to update dependencies edit project.yml
   spec.add_runtime_dependency "dry-core", "~> 1.0", "< 2"