Add import

Author: sungshik

src/main/java/engineering/swat/watch/Watcher.java

@@ -42,6 +42,7 @@
 import engineering.swat.watch.impl.jdk.JDKDirectoryWatch;
 import engineering.swat.watch.impl.jdk.JDKFileTreeWatch;
 import engineering.swat.watch.impl.jdk.JDKFileWatch;
+import engineering.swat.watch.impl.jdk.JDKRecursiveDirectoryWatch;
 import engineering.swat.watch.impl.overflows.IndexingRescanner;
 import engineering.swat.watch.impl.overflows.MemorylessRescanner;