Update rules_docker to latest.

[xingao267]

Fixes #125

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[nlopezgi]

Can you update nodejs repo to:
http_archive(
name = "build_bazel_rules_nodejs",
sha256 = "6139762b62b37c1fd171d7f22aa39566cb7dc2916f0f801d505a9aaf118c117f",
strip_prefix = "rules_nodejs-0.9.1",
urls = ["https://github.com/bazelbuild/rules_nodejs/archive/0.9.1.zip"],
)

approved by mistake

[xingao267]

Done.

[erain]

We can merge this PR if all tests passes, except the examples/hellogrpc/py failed in Travis. (This is because the root cause of the failure is with py_image and has nothing to do with the PRs, see #143 replies)

[erain]

I fixed the secret of Travis CI, so at least now Travis will actually run and failed "the right way".

[fejta]

This also seems to fix #149 (bazel <build|test> //... works again)