Bump jetty-servlet from 9.4.14.v20181114 to 9.4.20.v20190813#211

dependabot-preview[bot] wants to merge 1 commit intomasterngocbd/pokerserver:masterfrom

dependabot/gradle/org.eclipse.jetty-jetty-servlet-9.4.20.v20190813ngocbd/pokerserver:dependabot/gradle/org.eclipse.jetty-jetty-servlet-9.4.20.v20190813Copy head branch name to clipboard