Do not downcase OS name

bin/vm-info

@@ -16,7 +16,7 @@ def read_os_name
   return nil unless File.exist?("/etc/os-release")
   File.readlines("/etc/os-release").each do |line|
     if line =~ /^PRETTY_NAME="(.+)"$/
-      return $1.strip.delete('"').downcase
+      return $1.strip.delete('"')
     end
   end
   nil