CommandLineTest: Print commands being ran

This makes the test output a bit more easier to read.

Author: matthijskooijman

app/test/processing/app/CommandLineTest.java

@@ -83,6 +83,8 @@ public Process runArduino(boolean output, boolean success, File wd, String[] ext
     args.add(arduinoPath.getAbsolutePath());
     args.addAll(Arrays.asList(extraArgs));
 
+    System.out.println("Running: " + String.join(" ", args));
+
     Process pr = rt.exec(args.toArray(new String[0]), null, wd);
     if (output) {
       IOUtils.copy(pr.getInputStream(), System.out);