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Fixes #624

Added "Export to Excel" button in Table.jsx

Screen Shot 2020-04-22 at 7 42 03 PM

[ x] For CoronaTracker, did you bump the version in package.json?
- Update the second decimal for a major change
- Update the third decimal for a minor change
- Numbers can go past 9, e.g. 1.0.9 => 1.0.10
- For more info, read about Semantic Versioning
[x ] Did you add any new tests as necessary?
[x ] Is your PR rebased off the most current master?
[x ] Have you squashed all commits? (can be done at merge)
[x ] Did you use yarn not npm? (important!)
[ x] Did you use Material-UI wherever possible?
[x ] Did you run yarn lint on the code?
[ x] Did you run all of your most recent changes locally to make sure everything is working?