Bump googleapis-common-protos version

[bjwatson]

Have some updates to LRO and HTTP request.

PR for updating this package is separate: https://github.com/googleapis/api-client-staging/pull/50

[codecov-io]

Current coverage is 91.23% (diff: 100%)

Merging #141 into master will not change coverage

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[geigerj]

I see only 1.3.4 on PyPI: https://pypi.python.org/pypi/googleapis-common-protos

Are we tracking what changes are being made to this package somehow? It's supposed to be fully autogenerated, but since there are currently hand edits it would be useful to be able to see what is changing.

[bjwatson]

@geigerj See the PR I linked to above. It contains what changed (along with speech and LRO GAPIC stuff)

[bjwatson]

I will be sure to publish everything in the correct order (commonprotos, then grpc stuff, and finally gapic stuff)