Added note about timestamp granularity in MutationApi interface.

[rahulKQL]

For documentation about the timestamp format for Mutation#setCell APIs.

[codecov]

Codecov Report

Merging #39 into master will increase coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #39      +/-   ##
============================================
+ Coverage      81.1%   81.26%   +0.15%     
- Complexity      914      937      +23     
============================================
  Files            93       95       +2     
  Lines          5701     5839     +138     
  Branches        302      325      +23     
============================================
+ Hits           4624     4745     +121     
+ Misses          919      918       -1     
- Partials        158      176      +18

Impacted Files	Coverage Δ	Complexity Δ
...ble/data/v2/stub/EnhancedBigtableStubSettings.java	93.49% <0%> (-5.23%)	17% <0%> (ø)
...oud/bigtable/emulator/v2/BigtableEmulatorRule.java	90% <0%> (ø)	5% <0%> (?)
...om/google/cloud/bigtable/emulator/v2/Emulator.java	59.13% <0%> (ø)	14% <0%> (?)
...d/bigtable/data/v2/stub/readrows/StateMachine.java	87.59% <0%> (+31%)	15% <0%> (+4%)	⬆️

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[igorbernstein2]

we should not be advertising server timestamps. They don't play well with retries

[rahulKQL]

Thanks for the review, I have reworded the JavaDoc. Please take a fresh look.

[igorbernstein2]

LGTM