Bump org.apache.maven.plugins:maven-repository-plugin from 2.3.1 to 2.4 (#29)

Bumps org.apache.maven.plugins:maven-repository-plugin from 2.3.1 to 2.4.

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-repository-plugin
  dependency-version: '2.4'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -36,7 +36,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
-        <maven.plugin.repository.version>2.3.1</maven.plugin.repository.version>
+        <maven.plugin.repository.version>2.4</maven.plugin.repository.version>
         <maven.clean.plugin.version>3.1.0</maven.clean.plugin.version>
         <maven.javadoc.plugin.version>3.0.1</maven.javadoc.plugin.version>
         <maven.source.version>3.3.1</maven.source.version>