Bump dropwizard.version from 1.3.1 to 1.3.12

Bumps `dropwizard.version` from 1.3.1 to 1.3.12.

Updates `dropwizard-core` from 1.3.1 to 1.3.12
- [Release notes](https://github.com/dropwizard/dropwizard/releases)
- [Changelog](https://github.com/dropwizard/dropwizard/blob/master/RELEASES.md)
- [Commits](dropwizard/dropwizard@v1.3.1...v1.3.12)

Updates `dropwizard-client` from 1.3.1 to 1.3.12
- [Release notes](https://github.com/dropwizard/dropwizard/releases)
- [Changelog](https://github.com/dropwizard/dropwizard/blob/master/RELEASES.md)
- [Commits](dropwizard/dropwizard@v1.3.1...v1.3.12)

Updates `dropwizard-testing` from 1.3.1 to 1.3.12
- [Release notes](https://github.com/dropwizard/dropwizard/releases)
- [Changelog](https://github.com/dropwizard/dropwizard/blob/master/RELEASES.md)
- [Commits](dropwizard/dropwizard@v1.3.1...v1.3.12)

pom.xml

@@ -51,7 +51,7 @@
     </distributionManagement>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <dropwizard.version>1.3.1</dropwizard.version>
+        <dropwizard.version>1.3.12</dropwizard.version>
         <hystrix.version>1.5.12</hystrix.version>
         <slf4j.version>1.7.25</slf4j.version>
         <mockito.version>2.18.0</mockito.version>