Use Enum.parse

src/ameba/severity.cr

@@ -21,18 +21,11 @@ module Ameba
     # ```
     #
     def self.from_name(name : String)
-      case name.downcase
-      when "error"
-        Error
-      when "warning"
-        Warning
-      when "refactoring"
-        Refactoring
-      else
+      parse(name)
+    rescue ArgumentError
       raise "Incorrect severity name #{name}. Try one of #{Severity.values}"
     end
   end
-  end
 
   # Converter for `YAML.mapping` which converts severity enum to and from YAML.
   class SeverityYamlConverter