Close file handle when user wants to stop reading

The documentation states:

    If the callback returns false, reading will stop and the file will be closed.

lib/line_reader.js

@@ -138,6 +138,7 @@
           newRead();
         } else {
           finish();
+          reader.close();
         }
       }
 
@@ -152,6 +153,7 @@
               newRead();
             } else {
               finish();
+              reader.close();
             }
           }
         });