lower case

Author: felixcheung

R/pkg/DESCRIPTION

@@ -13,7 +13,7 @@ Authors@R: c(person("Shivaram", "Venkataraman", role = c("aut", "cre"),
 License: Apache License (== 2.0)
 URL: http://www.apache.org/ http://spark.apache.org/
 BugReports: http://spark.apache.org/contributing.html
-OS_Type: unix
+OS_type: unix
 Depends:
     R (>= 3.0),
     methods