Bump libhandy to 1.0.0

The API is now stable.

meson.build

@@ -65,7 +65,7 @@ if get_option('telepathy')
   telepathy_glib = dependency('telepathy-glib', version: '>= 0.22.0')
 endif
 
-libhandy = dependency('libhandy-1', version: '>= 0.85.0', required: false)
+libhandy = dependency('libhandy-1', version: '>= 1.0.0', required: false)
 if not libhandy.found()
   libhandy_subproj = subproject(
     'libhandy',

libhandy @ 94313c20

-Subproject commit 709e08635bacc63c8e4894ccb6067f6cfe497f31
+Subproject commit 94313c206258860b2428712e7ece1d02c5177857