update dependencies

go.sum

@@ -61,8 +61,8 @@ github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/
 github.com/json-iterator/go v1.1.11/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
-github.com/justjanne/imgconv v1.4.0 h1:AHhKBxET1CnXhBLHJ1HBuQ/FeOc9U+pfd0J3Rw+cKts=
-github.com/justjanne/imgconv v1.4.0/go.mod h1:6uRn+br2dIv8K5G9iEVjAmBan0/GAW2++OEAVDuk0GE=
+github.com/justjanne/imgconv v1.4.1 h1:byVibYVhfJZeQAaWwsU3EenvPOIf5OD2pnimc56IbS0=
+github.com/justjanne/imgconv v1.4.1/go.mod h1:6uRn+br2dIv8K5G9iEVjAmBan0/GAW2++OEAVDuk0GE=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=