* Update all dependencies
* Remove all `[[constraint]]` from Gopkg.toml
* Add in the minimum number of `[[override]]` to build
* Remove go get of github.com/inconshreveable/mousetrap as it is vendored
* Update docs with new policy on constraints
The packages in this directory are pre-release and thus are subject to change.
Also note that due to their preview nature breaking changes can be introduced outside
major version revisions of the SDK.
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