Merge pull request appium#259 from nicolasavenza/patch-1

Fix missing dashes in server flag

Author: Jonahss

src/main/java/io/appium/java_client/service/local/flags/GeneralServerFlag.java

@@ -75,7 +75,7 @@ public enum GeneralServerFlag implements ServerArgument{
  * Show timestamps in console output <br/>
  * Default: false
  */
- LOG_TIMESTAMP("log-timestamp"),
+ LOG_TIMESTAMP("--log-timestamp"),
  /**
  * Use local timezone for timestamps <br/>
  * Default: false