Bump jetty.version from 9.4.17.v20190418 to 9.4.18.v20190429 (#2752)

Bumps `jetty.version` from 9.4.17.v20190418 to 9.4.18.v20190429.

Updates `jetty-server` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `jetty-util` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `jetty-webapp` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `jetty-continuation` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `jetty-servlet` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `jetty-servlets` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `jetty-http` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `jetty-alpn-openjdk8-server` from 9.4.17.v20190418 to 9.4.18.v20190429

Updates `http2-server` from 9.4.17.v20190418 to 9.4.18.v20190429

Updates `http2-client` from 9.4.17.v20190418 to 9.4.18.v20190429

Updates `jetty-client` from 9.4.17.v20190418 to 9.4.18.v20190429
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.17.v20190418...jetty-9.4.18.v20190429)

Updates `http2-http-client-transport` from 9.4.17.v20190418 to 9.4.18.v20190429

Updates `jetty-alpn-openjdk8-client` from 9.4.17.v20190418 to 9.4.18.v20190429

Updates `jetty-alpn-conscrypt-server` from 9.4.17.v20190418 to 9.4.18.v20190429

Updates `jetty-alpn-java-server` from 9.4.17.v20190418 to 9.4.18.v20190429

Updates `jetty-alpn-java-client` from 9.4.17.v20190418 to 9.4.18.v20190429

Signed-off-by: dependabot[bot] <support@dependabot.com>

dropwizard-bom/pom.xml

@@ -22,7 +22,7 @@
         <guava.version>27.1-jre</guava.version>
         <jersey.version>2.28</jersey.version>
         <jackson.version>2.9.8</jackson.version>
-        <jetty.version>9.4.17.v20190418</jetty.version>
+        <jetty.version>9.4.18.v20190429</jetty.version>
         <servlet.version>3.0.0.v201112011016</servlet.version>
         <metrics4.version>4.1.0-rc3</metrics4.version>
         <slf4j.version>1.7.26</slf4j.version>