assign order-review maturity of 1

Maturity Level | Maturity title | Requirements
--- | --- | ---
0 | Draft | Hook is defined according to the [hook definition format](#hook-definition-format). 
1 | Submitted  | _The above, and …_ Hook definition is written up as a [github pull request](https://github.com/cds-hooks/docs/tree/master/docs/hooks) using the [Hook template](hooks/template/) and community feedback is solicited on the [zulip CDS Hooks stream](https://chat.fhir.org/#narrow/stream/17-cds-hooks).
2 | Tested | _The above, and …_ The hook has been tested and successfully supports interoperability among at least one CDS client and two independent CDS services using semi-realistic data and scenarios (e.g. at a FHIR Connectathon). The github pull request defining the hook is approved and published.

Author: isaacvetter

docs/hooks/order-review.md

@@ -4,6 +4,7 @@
 | ---- | ----
 | specificationVersion | 1.0
 | hookVersion | 1.0
+| Hook maturity | [1 - Submitted](specification/1.0/#hook-maturity-model)
 
 ## Workflow