Update child repos to PSR-4 for git subs-plit

Fugbix typo.

To whom it may concern,

I believe I've stumbled upon an unintentional typographical error in your online documentation. I pray you will find my pull request helpful in rectifying this situation.

Your friend in code,

- Jeff

Merge remote-tracking branch 'origin/master' into 0.3

* origin/master:
  Change react/promise constraints to use tilde operator

Conflicts:
	composer.lock
	src/React/Dns/composer.json
	src/React/Stream/composer.json

[cache] Fix typo in ArrayCache::remove()