Squash merge branch 'weighted', see #14

Squashed commit of the following:

commit b83d3149d0
Author: makeworld <makeworld@protonmail.com>
Date:   Tue Dec 20 21:04:58 2022 -0500

    Use didder lib release

commit d5f70ad511
Author: makeworld <makeworld@protonmail.com>
Date:   Tue Dec 20 14:42:30 2022 -0500

    Use weighted branch of dither lib

    See https://github.com/makeworld-the-better-one/didder/issues/14

go.mod

@@ -4,7 +4,7 @@ go 1.16
 
 require (
 	github.com/disintegration/imaging v1.6.2
-	github.com/makeworld-the-better-one/dither/v2 v2.2.0
+	github.com/makeworld-the-better-one/dither/v2 v2.3.0
 	github.com/urfave/cli/v2 v2.3.0
 	golang.org/x/image v0.0.0-20210220032944-ac19c3e999fb
 )

go.sum

@@ -5,8 +5,8 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1ei82L+c=
 github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
-github.com/makeworld-the-better-one/dither/v2 v2.2.0 h1:VTMAiyyO1YIO07fZwuLNZZasJgKUmvsIA48ze3ALHPQ=
-github.com/makeworld-the-better-one/dither/v2 v2.2.0/go.mod h1:VBtN8DXO7SNtyGmLiGA7IsFeKrBkQPze1/iAeM95arc=
+github.com/makeworld-the-better-one/dither/v2 v2.3.0 h1:s9wgm88KFZSzvZh9gL79tPayp5sDUGIku/1aJewxlB4=
+github.com/makeworld-the-better-one/dither/v2 v2.3.0/go.mod h1:VBtN8DXO7SNtyGmLiGA7IsFeKrBkQPze1/iAeM95arc=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=