Reverting d4d3934 to prune again

It was a bad idea to implement that change so I'm adding it back.
This will be later revisited with an option.
docs: README 80 char limit

Removed some trailing spaces.
Updated github reference from sag47 to samrocketman.
docs: CHANGELOG 80 char limit
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docs: upgrade_0.2.x-0.3.x 80 char limit
docs: upgrade_0.3.x-0.4.x 80 char limit