0.31.0

What's Changed

• Change to protected AbstractClassResolver::doResolve() by @JesusValera in #230
• Add container factory method by @Chemaclass in #229
• Remove useless ContainerException::notFound() by @JesusValera in #232
• Add container extend method by @Chemaclass in #231

Full Changelog: 0.30.1...0.31.0