Fix formatting, typos, more in README

- Delete duplicated bombLens line
- Fix accidental link by wrapping in code markup
- Fix spelling of “except”, “compose”, “with”, “implementation”, “implementations”, “Bomberman” (spelled like https://en.wikipedia.org/wiki/Bomberman_%28video_game%29)
- Capitalize “Scala”
- Correct the placement of a comma
Merge pull request #1 from roryokane/patch-1

Fix formatting, typos, more in README