Specify correct valac version requirement

v0.36, not v0.26

debian/control

@@ -5,7 +5,7 @@ Maintainer: Adrian Cochrane <alcinnz@lavabit.com>
 Build-Depends: meson,
                debhelper (>= 9),
                libgtk-3-dev,
-               valac (>= 0.26)
+               valac (>= 0.36)
 Standards-Version: 3.9.3
 
 Package: writeas-gtk