Release 0.7.0

Declare thrown exceptions

Fix README

Fix Changelog formatting

Implement `DependencyResolver->resolve()`

It first checks if entry is present in the container and prefers it,
otherwise it constructs a new one with `->construct()`.

Implement DependencyResolver::call()

Mention Dawid and his work @ https://github.com/igniphp/container

Update README

Provide README