Improve slice action creator types

[denisw]

Instead of ...args: any[], each action creator now expects the payload inferred from the corresponding case reducer.

Fixes #93.

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[markerikson]

@denisw : I'm seeing a TS compilation failure in Travis, and also showing up locally:

src/createSlice.test.ts:38:35 - error TS2345: Argument of type 'Action<any>' is not assignable to parameter of type 'PayloadAction<any, string>'.
38         expect(reducer(undefined, actions.increment())).toEqual(1)
                                     ~~~~~~~~~~~~~~~~~~~
src/createSlice.test.ts:78:33 - error TS2345: Argument of type 'Action<any>' is not assignable to parameter of type 'PayloadAction<any, string>'.
  Property 'payload' is missing in type 'Action<any>' but required in type 'PayloadAction<any, string>'.
78       expect(reducer(undefined, actions.increment())).toEqual(1)
                                   ~~~~~~~~~~~~~~~~~~~
  src/createAction.ts:12:3
    12   payload: P
         ~~~~~~~
    'payload' is declared here.

[denisw]

@markerikson Fixed now.

[markerikson]

Great, thanks!

[jerolimov]

This was a great improvement when using the actions. 👍