Pub needs an SDK constraint because we use ^ version constraints
Pub needs an SDK constraint because we use ^ version constraints

---

Missing requirements:
* Older versions of pub don't support ^ version constraints.
  Make sure your SDK constraint excludes those old versions:

  environment:
    sdk: ">=1.8.0 <2.0.0"

  Or use a fully-expanded constraint:

  dependencies:
    cassowary: ">=0.1.6 <0.2.0"
...
Sorry, your package is missing a requirement and can't be published yet.

Review URL: https://codereview.chromium.org/1225303002 .

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