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Fix lowerbound on Dune for ppxlib.0.5.0

ppxlib appears to be affected by a variation on ocaml/dune#1549,
fixed by ocaml/dune#1551 Dune 1.6.0.

Changed files
+1 -1
packages
ppxlib
ppxlib.0.5.0
+1 -1
packages/ppxlib/ppxlib.0.5.0/opam
···
depends: [
"ocaml" {>= "4.04.1" & < "4.08.0"}
"base" {>= "v0.11.0"}
-
"dune"
+
"dune" {>= "1.6.0"}
"ocaml-compiler-libs" {>= "v0.11.0"}
"ocaml-migrate-parsetree" {>= "1.0.9" & < "2.0.0"}
"ppx_derivers" {>= "1.0"}