Bump fluent-plugin-google-cloud gem version to 0.6.7

[rahulkavale]

Hi,
The fluent-plugin-google-cloud gem has now released version 0.6.7.
I am raising this pull request to update the same in google-fluentd.

I have built the plugin locally(on OSX) with the changes. Kindly let me know what kind of other verifications can be done from my side if any.

I referred to previous PR for the similar version update for the gem #41 .

One particular feature I was awaiting was the support of operation in LogEntry.
The latest version of fluent-plugin-google-cloud has included support for operation in LogEntry.
Corresponding PR in the plugin - GoogleCloudPlatform/fluent-plugin-google-cloud#145 .

Please let me know if you need any changes in the PR, I tried to find the contributors guideline but could not find it.

Thanks in advance!

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[rahulkavale]

I signed it!

[googlebot]

CLAs look good, thanks!

[qingling128]

LGTM.

[qingling128]

Releasing google-fluentd v1.5.18 in a bit.

[qingling128]

Hi @rahulkavale, we've released v1.5.18, yet will postpone marking it as stable till Monday to avoid any potential panic during the weekend. In case you want to try it asap, you could use this to install it:

curl -s "https://dl.google.com/cloudagents/install-logging-agent.sh" | sudo REPO_SUFFIX="unstable" bash