README: Removes double spaces on a couple code lines.
README: Removes double spaces on a couple code lines.

Double spaces on the end of lines are not required in code blocks, so I
standardised it for the block.

Signed-off-by: William Floyd <b973257027e4d0628a786bbeefc24d99291a3fe4@gmail.com>

W-Floyd/smelt,W-Floyd/furnace