add scale option

TODO

@@ -0,0 +1,3 @@
+Todo:
+  ☐ Upload button
+  ☐ Color group

myapp/cli.py

@@ -48,5 +48,6 @@ def generate_palette(image, target, n_colors, shades):
 @click.option("--text", required=True)
 @click.option("--background", type=ImageParamType(), required=True)
 @click.option("--target", type=click.Path(dir_okay=False), required=True)
-def generate_qr_code(text, background, target):
-    write_artistic(segno.make(text), background.filename, target)
+@click.option("--scale", type=click.IntRange(min=3, max=15), default=9)
+def generate_qr_code(text, background, target, scale):
+    write_artistic(segno.make(text), background.filename, target, scale=scale)