Added member option

Signed-off-by: Michael Schnuerle <1285077+schnuerle@users.noreply.github.com>

Author: schnuerle

modes/micromobility.md

@@ -75,7 +75,7 @@ The `trip_attributes` object is not used in this mode.
 ### Fare Attributes
 
 The `fare_attributes` object may have the following key value pairs:
-- `rate_code_id` (enumerated, Optional) - one of `standard`, `access`
+- `rate_code_id` (enumerated, Optional) - one of `standard`, `access`, `member`
 
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