Update README.md

Misspelt Capsule as "Capusle"
charset key is now required
We need Illuminate/Container
Pass Illuminate\Container through to Illuminate\ConnectionFactory
Merge branch 'patch-1' of github.com:pokmot/capsule
Merge branch 'patch-1' of github.com:alexbilbie/capsule
Merge branch 'master' of github.com:tobysteward/capsule