Bump standards to 3.9.2.

... after having carefully read the upgrading checklist.

debian/changelog

 backupninja (0.9.9-1) UNRELEASED; urgency=low
 
+  * Bump Standards version: no changes
   * New upstream release
     . Use locking to avoid running concurrent instances of the same
       backup action. (Closes: #511300)

debian/control

@@ -4,7 +4,7 @@ Priority: optional
 Maintainer: Micah Anderson <micah@riseup.net>
 Build-Depends: debhelper (>= 5.0.0), autoconf, automake
 Build-Conflicts: autoconf2.13
-Standards-Version: 3.9.1
+Standards-Version: 3.9.2
 Homepage: https://labs.riseup.net/code/projects/show/backupninja
 Vcs-Git: git://labs.riseup.net/backupninja.git