ResourceOpener: Close input file resources.

Author: blackwinter

metafacture-io/src/main/java/org/metafacture/io/ResourceOpener.java

@@ -68,8 +68,8 @@ public void setEncoding(final String encoding) {
 
     @Override
     public void process(final String file) {
-        try {
-            getReceiver().process(ResourceUtil.getReader(file, encoding));
+        try (Reader reader = ResourceUtil.getReader(file, encoding)) {
+            getReceiver().process(reader);
         }
         catch (final IOException e) {
             throw new MetafactureException(e);