Error with multiple type-hinted arguments

[kylebamos]

When attempting to inject multiple type-hinted kwargs:

@di.inject(foo='foo', bar='bar')
def baz(foo: Foo = None, bar: Bar = None):
    ...

[akatrevorjay]

For 3.3+ we should implement the Signature interface, which honestly is perfect compared to what Python's had before (absolute crap).
https://docs.python.org/3/library/inspect.html#inspect.signature

I noticed this with annotations in 3.5, I'll add this to the todo.

[timmartin19]

I had the same problem with a argument injected before a keyword

@DI.inject('foo')
 def baz(foo: object, bar: object = None) -> None:
     pass