update changelog format with version links

fix: Container::callableKey()

Support `"psr/container": ">=1.1"`

fix: remove 8.0 from CI

Set 0.5.1 version in changelog

set 0.5 in changelog

Update changelog

Merge pull request #9 from gacela-project/rename-project-container

Rename project to container

Merge pull request #4 from gacela-project/group-exceptions

Group exceptions in its own dir

Rename dependency-resolver to resolver