Pin runtime numpy to <1.20.0a0
Description
This MR pins the runtime numpy requirement back to numpy<1.20.0a0. See #414 (closed).
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.
Review Status
Help me @karl-wette, you're my only hope.