Update dependencies

Signed-off-by: Janne Mareike Koschinski <janne@kuschku.de>

go.mod

@@ -4,7 +4,7 @@ go 1.15
 
 require (
 	github.com/go-redis/redis/v8 v8.11.5
-	github.com/justjanne/imgconv v1.4.0
+	github.com/justjanne/imgconv v1.4.1
 	github.com/prometheus/client_golang v1.11.1
 	gopkg.in/gographics/imagick.v3 v3.4.0
 )