Merge pull request #182 from browserup/dependabot/gradle/jettyVersion-9.4.21.v20190926

Bump jettyVersion from 9.4.20.v20190813 to 9.4.21.v20190926

Author: dpowell

build.gradle

@@ -33,7 +33,7 @@ subprojects {
     sourceCompatibility=1.8
 
     ext {
-        jettyVersion = '9.4.20.v20190813'
+        jettyVersion = '9.4.21.v20190926'
         log4jVersion = '2.12.1'
         slf4jVersion = '1.7.28'
     }