v1.6.0

• Bug: Argument resolver did not resolve Definitions
• DefinitionClass now does not require a class name. When not specified, the container will find the class being resolved with the definition and use it. This allows us to write (in definition array): MyClass::class => get() and not MyClass::class => get(MyClass::class)
• Add interface InvokerInterface for method call
• Add interface ArgumentResolverInterface for the method resolveArguments()
• Internal refactoring and code splitting.