Bump mockserver-netty from 5.14.0 to 5.15.0 (closes #49)

Bumps [mockserver-netty](https://github.com/jamesdbloom/mockservice) from 5.14.0 to 5.15.0.
- [Release notes](https://github.com/jamesdbloom/mockservice/releases)
- [Changelog](https://github.com/mock-server/mockserver/blob/master/changelog.md)
- [Commits](https://github.com/jamesdbloom/mockservice/compare/mockserver-5.14.0...mockserver-5.15.0)

Change-Id: Ica586c6f5f75c938ae98726af4f38a74a77c6911

---
updated-dependencies:
- dependency-name: org.mock-server:mockserver-netty
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Change-Id: I23026ed6b41215d5b5de5756781565d9b31fbf71
diff --git a/pom.xml b/pom.xml
index 1c252ee..b397c5e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -86,7 +86,7 @@
     <dependency>
       <groupId>org.mock-server</groupId>
       <artifactId>mockserver-netty</artifactId>
-      <version>5.14.0</version>
+      <version>5.15.0</version>
       <scope>test</scope>
     </dependency>