[Snyk] Security upgrade emitter-io from 2.0.2 to 2.704

Snyk has created this PR to fix one or more vulnerable packages in the `pip` dependencies of this project.

Changes included in this PR

Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
- unbrake-api/production/requirements.txt

⚠️ Warning

``` graphql-relay 0.5.0 has requirement graphql-core<2,>=0.5.0, but you have graphql-core 2.3.2. graphene-django 3.0.0 has requirement graphql-core<4,>=3.1.0, but you have graphql-core 2.3.2. graphene-django 3.0.0 has requirement graphene<4,>=3.0, but you have graphene 2.1.3. graphene-django 3.0.0 has requirement graphql-relay<4,>=3.1.1, but you have graphql-relay 0.5.0. graphene-django 3.0.0 has requirement Django>=3.2, but you have Django 1.11.29. ```

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	589/1000 Why? Has a fix available, CVSS 7.5	Information Exposure SNYK-PYTHON-EMITTERIO-570768	`emitter-io:` `2.0.2 -> 2.704`	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the affected dependencies could be upgraded.

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fga-eps-mds / 2019.1-unbrake