Update README.md

A typo on the fourth word is hard to miss.
Plus some sentence refactoring (because I was already there)
Merge pull request #668 from michaeljoseph/patch-1

Update README.md
Add additional title attributes to links for enhanced screen reader accessibility.
Merge pull request #677 from ndarilek/master

Add additional title attributes to links for enhanced screen reader acce...
Request the v3 media type via the Accept header.
s/master_branch/default_branch
Merge pull request #1 from prose/master

Pulling changes from source project