Release v1.2.0

[hanzei]

Needed to release a new version that has platform specific bundles.

Needed changes:

• [x] https://github.com/mattermost/mattermost-plugin-aws-SNS/pull/50
• [x] https://github.com/mattermost/mattermost-plugin-aws-SNS/pull/52
• [x] https://github.com/mattermost/mattermost-plugin-aws-SNS/pull/54
• [x] https://github.com/mattermost/mattermost-plugin-aws-SNS/pull/56

[justinegeffen]

@hanzei, when will this be ready for release? I'd like to create the Gitbook for it.

[hanzei]

The release is current awaiting the review of @DHaussermann, but I don't expect it to happen before Christmas.