Update time synced accel packets

[andrewjaykeller]

1.2.0

New Features

• Add tutorial/sample code for interfacing the module with lab streaming layer.

  Breaking Changes

• Fixed time synced accel to work OpenBCI_32bit_Library release candidate 5 and newer.

  Notes

In release candidate 5 for the OpenBCI firmware 2.0.0 time sync access packets send the access data in packets % 10 7,8,9 versus 0,1,2 in earlier release candidates.

[codecov-io]

Current coverage is 92.60% (diff: 100%)

Merging #72 into master will not change coverage

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