William Chargin e572551cd8
mirror: add internal method _createUpdate (#868)
Summary:
It’s useful to add this simple function now because the rest of the
commits required to implement #622 will want to use it extensively in
test code. Actual clients of the API will not need to use it, because
the concept of “updates” is an implementation detail: clients will
always provide simple timestamps.

Test Plan:
Unit tests included, with full coverage; run `yarn unit`.

wchargin-branch: mirror-createupdate
2018-09-20 11:12:21 -07:00
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