Fix addon notes

[usulpro]

Issue:
currently storiesOf has such API:

storiesOf(...).add(name, (context) => { /* return <Component /> */ })

so addonNotes should pass context as well, but it doesn't

What I did

added context prop to a function returning by addonNotes

How to test

this should work:

.add('with some text', 
  addonNotes({ notes: 'Hello guys' })((context) => <div>Hello {context.story}</div>)
)

[codecov]

Codecov Report

Merging #1448 into release/3.2 will not change coverage.
The diff coverage is 0%.

@@             Coverage Diff              @@
##           release/3.2    #1448   +/-   ##
============================================
  Coverage        15.91%   15.91%           
============================================
  Files              237      237           
  Lines             5047     5047           
  Branches           627      690   +63     
============================================
  Hits               803      803           
+ Misses            3725     3662   -63     
- Partials           519      582   +63

Impacted Files	Coverage Δ
addons/notes/src/index.js	0% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-start.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
addons/events/src/components/Event.js	0% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	49.42% <0%> (ø)	⬆️
addons/knobs/src/KnobManager.js	35.41% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
... and 26 more

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[usulpro]

Thanks