Added AutoCloseable.

src/com/esotericsoftware/yamlbeans/YamlReader.java

@@ -46,7 +46,7 @@
 
 /** Deserializes Java objects from YAML.
  * @author <a href="mailto:[email protected]">Nathan Sweet</a> */
-public class YamlReader {
+public class YamlReader implements AutoCloseable {
 	private final YamlConfig config;
 	Parser parser;
 	private final Map<String, Object> anchors = new HashMap();

src/com/esotericsoftware/yamlbeans/YamlWriter.java

@@ -47,7 +47,7 @@
 
 /** Serializes Java objects as YAML.
  * @author <a href="mailto:[email protected]">Nathan Sweet</a> */
-public class YamlWriter {
+public class YamlWriter implements AutoCloseable {
 	private final YamlConfig config;
 	private final Emitter emitter;
 	private boolean started;