Add Contributors

Author: civitaspo

README.md

@@ -119,3 +119,7 @@ $ ./gradlew gem  # -t to watch change of files and rebuild continuously
 ## Note
 
 This plugin uses "org.apache.commons:commons-vfs" and the library uses the logger "org.apache.commons.logging.Log". So, this plugin suppress the logger's message except when embulk log level is debug.
+
+## Contributors
+- Satoshi Akama (@sakama)
+- Rudolph Miller (@Rudolph-Miller)