Example fix: Set the type of the store

[btastic]

Hey there,

I just watched your talk on the dart conference. Great job! I was eager to try out your library and went straight to the examples when I stumbled on this part of the code:

final store = new Store(counterReducer, initialState: 0);

I am not sure if this is because of the new Dart SDK dart2.0.0-dev.16.0, but the line is causing the following warning:

[dart] A function of type '(int, Object) → int' can't be assigned to a variable of type '(dynamic, dynamic) → dynamic'.

I just went ahead and fixed the sample, it is a small contribution, but I think others that are new to the library will be less confused than I was.

[codecov]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #4   +/-   ##
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  Coverage   95.58%   95.58%           
=======================================
  Files           1        1           
  Lines          68       68           
=======================================
  Hits           65       65           
  Misses          3        3

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[brianegan]

Hey, glad ya liked the talk :) Thanks so much for the fix!