Bump com.googlecode.maven-download-plugin:download-maven-plugin (#219)

Bumps [com.googlecode.maven-download-plugin:download-maven-plugin](https://github.com/maven-download-plugin/maven-download-plugin) from 1.6.8 to 1.8.0.
- [Release notes](https://github.com/maven-download-plugin/maven-download-plugin/releases)
- [Commits](maven-download-plugin/maven-download-plugin@1.6.8...1.8.0)

---
updated-dependencies:
- dependency-name: com.googlecode.maven-download-plugin:download-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -482,7 +482,7 @@
 			<plugin>
 				<groupId>com.googlecode.maven-download-plugin</groupId>
 				<artifactId>download-maven-plugin</artifactId>
-				<version>1.6.8</version>
+				<version>1.8.0</version>
 				<configuration>
 					<skipCache>true</skipCache>
 					<overwrite>false</overwrite>