Fix weird space in bracketed name making dch not work properly

debian/changelog

@@ -1,6 +1,6 @@
 dpkg (1.15.0) UNRELEASED; urgency=low
 
-  [ Guillem Jover ]
+  [ Guillem Jover ]
   * Do not suggest manually changing the alternative symlinks on
     update-alternative's verbose mode. Closes: #412487
   * Refactor subprocess signal setup.