Changes in dconf 0.39.1
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 - build: improve libdconf visible symbols (Inigo Martinez, Daniel Playfair
   Cal, !59)
 - engine: do not emit optimistic change notifications unless the local value
   is different (Daniel Playfair Cal, !2)
 - build: minor fixes to bash completion script (Philip Withnall, !64)
 - service: add a systemd unit for D-Bus activation (Simon McVittie, !63)