Update README image with pretty output

[hugovk]

Follow on from https://github.com/hugovk/norwegianblue/pull/116.

Use a bigger image than last time.

Put through optipng -o7 -zm1-9:

609x317 pixels, 4x8 bits/pixel, RGB+alpha
Reducing image to 3x8 bits/pixel, RGB
Input IDAT size = 53331 bytes
Input file size = 56760 bytes

Trying:
  zc = 9  zm = 9  zs = 0  f = 0     IDAT size = 34440
  zc = 7  zm = 1  zs = 0  f = 22

Selecting parameters:
  zc = 9  zm = 9  zs = 0  f = 0     IDAT size = 34440

Output IDAT size = 34440 bytes (18891 bytes decrease)
Output file size = 37833 bytes (18927 bytes = 33.35% decrease)

[codecov[bot]]

Codecov Report

Merging #118 (0bc053b) into main (71fcbb5) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #118   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files           9        9           
  Lines         392      392           
=======================================
  Hits          374      374           
  Misses         18       18           

Flag	Coverage Δ
macos-latest	95.40% <ø> (ø)
ubuntu-latest	95.40% <ø> (ø)
windows-latest	95.40% <ø> (ø)

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[hugovk]

Resized in https://github.com/hugovk/norwegianblue/commit/a90495caded6c33ef1db2625c56445dd1f9e00c4 because, on mobile, GitHub doesn't respect the width and height so the aspect ratio is bad.

Before	After

This is now 370, I think ideally it should be 334 wide, but this will do for now.