Updates version number to 0.4.170522069.20170929.
Updates version number to 0.4.170522069.20170929.

Significant changes:
- Addressed encoding issues in warnings and errors.
- Resolved undefined behavior in post_processor.

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PiperOrigin-RevId: 170523171
MOS_MIGRATED_REVID=170523171

bazelbuild/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi,pinterest/tulsi,pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi