Fix centered addon for IE11

[sam-at-work]

Issue:
#2525

What I did

Fix the style rules for centered add on so that it works correctly in IE11

How to test

Look at centered add on in IE 11. Components will now be correctly centered

[sam-at-work]

@brianespinosa you might be interested in checking this?

[danielduan]

Looks good but I think this breaks some snapshots so those will need to be updated. @sam-at-work

yarn bootstrap, select core, then yarn test and select update

[codecov]

Codecov Report

Merging #3735 into master will decrease coverage by 0.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3735      +/-   ##
==========================================
- Coverage   41.59%   41.32%   -0.28%     
==========================================
  Files         462      459       -3     
  Lines        5147     5084      -63     
  Branches      866      853      -13     
==========================================
- Hits         2141     2101      -40     
+ Misses       2490     2473      -17     
+ Partials      516      510       -6

Impacted Files	Coverage Δ
addons/centered/src/styles.js	0% <ø> (ø)	⬆️
addons/info/src/index.js	76.19% <0%> (-2.98%)	⬇️
app/angular/src/server/angular-cli_utils.js	0% <0%> (ø)	⬆️
.../storyshots-core/src/frameworks/frameworkLoader.js
...s/storyshots-core/src/frameworks/vue/renderTree.js
...s/storyshots-core/src/frameworks/angular/loader.js
addons/storyshots/storyshots-core/.eslintrc.js
addons/storyshots/storyshots-core/src/api/index.js
.../storyshots-core/src/frameworks/require_context.js
...dons/storyshots/storyshots-core/src/test-bodies.js
... and 43 more

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[sam-at-work]

@danielduan I've updated the snapshots.
Got an error running yarn test then update:

$ yarn test
yarn run v1.7.0
$ node ./scripts/test.js
? Select which tests to run Update all snapshots (update)
● Validation Error:

  Module <rootDir>/node_modules/react-native/jest/assetFileTransformer.js in the transform option was not found.

  Configuration Documentation:
  https://facebook.github.io/jest/docs/configuration.html

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

but running node node_modules/jest/bin/jest.js -u worked.

[danielduan]

@Hypnosphi I'm not sure why the Danger CI is failing, but this looks good to go.