Regex match for old ruby versions

Author: ahteshamtariq

bin/wkhtmltopdf

@@ -29,7 +29,7 @@ suffix = case RbConfig::CONFIG['host_os']
            os_based_on_centos_7 = os.start_with?('amzn_2')
            os = 'centos_7' if os_based_on_centos_7
 
-           os_based_on_debian_9 = /deepin/.match?(os)
+           os_based_on_debian_9 = (/deepin/ =~ os)
            os = 'debian_9' if os_based_on_debian_9
 
            os_based_on_archlinux = os.start_with?('arch_') || os.start_with?('manjaro_')