Use blocking method rather than the throwing one

Avoid:
Exception in thread Thread-7 java.lang.IllegalStateException: Queue full
        at java.base/java.util.AbstractQueue.add(AbstractQueue.java:98)
        at java.base/java.util.concurrent.ArrayBlockingQueue.add(ArrayBlockingQueue.java:326)
        at org.jbake.maven.util.DirWatcher.onUpdated(DirWatcher.java:57)
        at org.jbake.maven.util.DirWatcher.accessbash00(DirWatcher.java:17)
        at org.jbake.maven.util.DirWatcher.onFileChange(DirWatcher.java:40)
        at org.apache.commons.io.monitor.FileAlterationObserver.doMatch(FileAlterationObserver.java:410)
        at org.apache.commons.io.monitor.FileAlterationObserver.checkAndNotify(FileAlterationObserver.java:333)
        at org.apache.commons.io.monitor.FileAlterationObserver.checkAndNotify(FileAlterationObserver.java:334)
        at org.apache.commons.io.monitor.FileAlterationObserver.checkAndNotify(FileAlterationObserver.java:303)
        at org.apache.commons.io.monitor.FileAlterationMonitor.run(FileAlterationMonitor.java:183)
        at java.base/java.lang.Thread.run(Thread.java:829)
which stops further processing of changed files.

jbake-maven-plugin/src/main/java/org/jbake/maven/util/DirWatcher.java

@@ -54,7 +54,11 @@ public void stop() {
   }
 
   private void onUpdated() {
-    changeQueue.add(Long.valueOf(System.currentTimeMillis()));
+    try {
+      changeQueue.put(Long.valueOf(System.currentTimeMillis()));
+    } catch (InterruptedException iex) {
+      Thread.currentThread().interrupt();
+    }
   }
 
   /**