Updates version number to 0.4.264899296.20190822.
Updates version number to 0.4.264899296.20190822.

Significant changes:
- Always build both armv7k and arm64_32 architectures when a
  physical watchOS device may be involved.
- Moved _tulsi-includes -> bazel-tulsi-includes.

PiperOrigin-RevId: 264903092

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