chore(deps): update dependency material-ui to v0.20.1

[renovate]

This Pull Request updates dependency material-ui from v0.20.0 to v0.20.1

Release Notes

v0.20.1

Compare Source

May 13, 2018

Big thanks to the 14 contributors who made this release possible.

Component Fixes / Enhancements

• [Tabs] Add support for inline style override for parent container of InkBar (#​9598) @​PharaohMaster
• Popover does not listen to events unless it is open at the moment (#​9482) @​romanzenka
• [EnhancedButton] Fix onClick event being fired twice on "Enter Key" press (#​9439) @​karaggeorge
• [Slider] Fix handle case where ref is null (#​10006) @​jony89
• [RaisedButton] Conditionally apply overlay backgroundColor (#​9811) @​walwoodr
• [Snackbar] Static properties for reason string constants (#​10300) @​RavenHursT
• [TextField] Fix caret position issue (#​10214) @​MaratFaskhiev
• Add sideEffects: false for webpack 4 (#​11167) @​matthoffner

Docs

• [docs] Adding smpl to showcase (#​9386) @​Bonitis
• [docs] Remove HEAD in versions list (#​9391) @​HZooly
• Add Governance Document (#​9423) @​hai-cea
• [docs] Add v1 recommendation to home page (#​9727) @​mbrookes
• [docs] Remove BrainBOK from showcase (#​11292) @​brainbok

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