Delete erroneous trailing {}s from README

I'm not familiar enough with this Gem but I'm guessing that {} used to
work in place of 'Hash.' It doesn't anymore, and this wasted a couple
minutes for me, so I'm fixing it here. I could be wrong though?
Merge pull request #34 from mrb/README_fix

Delete erroneous trailing {}s from README
Decode and encode urls before hex encode.

This ensures that urls are properly uri encoded before being sent to camo.
Don't double hexencode url.
Merge branch 'uri_encode' into feedbin