Merge pull request #14 from xstefank/fix-distinct

Add distinct to Upgrade mojo

plugin/src/main/java/org/wildfly/channelplugin/UpgradeComponentsMojo.java

@@ -237,7 +237,7 @@ public void execute() throws MojoExecutionException {
 
             // if channel was given as an input, insert channel repositories into the parent pom
             if (injectRepositories) {
-                Map<String, String> repositoriesToInject = channels.stream().flatMap(c -> c.getRepositories().stream())
+                Map<String, String> repositoriesToInject = channels.stream().flatMap(c -> c.getRepositories().stream()).distinct()
                         .collect(Collectors.toMap(Repository::getId, Repository::getUrl));
                 InjectRepositoriesMojo.insertRepositories(rootProject, rootManipulator, repositoriesToInject);
             }