Fix minor typo in CellSizeCache usage example

[clauderic]

:)

[codecov-io]

Current coverage is 98.18% (diff: 100%)

Merging #443 into master will not change coverage

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[clauderic]

On a side-note, I'm curious about CellSizeCache. Currently, it stores and does lookups based on row/cell indexes.

In a scenario where you may have elements that shift indexes but always remain the same size (for instance, when a list is reordered with react-sortable-hoc), what are your thoughts on a CellSizeCache implementation that would do lookup based on a cell's key property instead? (and, if no key is provided fallback on the index)

[bvaughn]

Ha! Look at that. Thanks buddy 😄