Mix: Upgrade mogrify library

The old library would modify a file on reading it, the new one
doesn't have this issue.

1 files changed, 1 insertions, 1 deletions

diff --git a/mix.exs b/mix.exs
index f91e0b007..91e70f238 100644
--- a/mix.exs
+++ b/mix.exs
@@ -138,7 +138,7 @@ defmodule Pleroma.Mixfile do
       {:cowlib, "~> 2.9", override: true},
       {:gun, "~> 2.0.0-rc.1", override: true},
       {:jason, "~> 1.2"},
-      {:mogrify, "~> 0.7.4"},
+      {:mogrify, "~> 0.9.1"},
       {:ex_aws, "~> 2.1.6"},
       {:ex_aws_s3, "~> 2.0"},
       {:sweet_xml, "~> 0.6.6"},