Shopify/toxiproxy v2.1.6 on GitHub

Use CHANGELOG.md for release description (#306, @miry)
Dependency updates in #294 introduced a breaking change in CLI argument parsing.
Now flags must be specified before arguments.
Previously, arguments could be specified prior to flags.
Update usage help text and documentation. (#308, @miry)
Run e2e tests to validate the command line and basic features of server,
client and application (#309, @miry)
Add /v2 suffix to module import path (#311, @dnwe)
Setup automated checking source code for security vulnerabilities (#312, @miry)
Setup code linter (#314, @miry)
- Max line length is 100 characters (#316, @miry)
- Linter to check whether HTTP response body is closed successfully (#317, @miry)
- Make sure the function are not big (#318, @miry)
  - Extract client flags specs to seprate methods.
    Introduce a new way to manage toxics with ToxicOptions sturcture (#321, @miry)
  - Split Proxy.server to multiple small (#322, @miry)
  - Extract initializetion of fake upstream server to test helper (#323, @miry)
  - Support a list of well knonwn linters (#326, @miry)
--host flag uses TOXIPROXY_URL if it is set (#319, @maaslalani)
Run benchmarks in CI/CD (#320, @miry)
Use scratch docker base image instead of alpine (#325, @miry)

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