remove date_stored, redundant with asset created/updated, resolves #6

Author: matthewhanson

README.md

@@ -36,7 +36,6 @@ with a STAC Item.  This extension does not cover NFS solutions provided by PaaS
 | storage:requester_pays        | bool      | Is the data requester pays or is it data manager/cloud provider pays. *Defaults to false* |
 | storage:tier                  | string    | The title for the tier type (as defined by PaaS provider) |
 | storage:tier_duration         | integer   | Minimum storage duration (in days) required before additional fees |
-| storage:date_stored           | string    | Date and time the corresponding asset placed into the current storage tier (relevant for tier_duration > 0). Format is RFC 3339. |
 | storage:first_byte_latency    | string    | approximate time unit (milliseconds, minutes or hours) for accessing first byte of data |
 
 ### Additional Field Information

json-schema/schema.json

@@ -73,11 +73,6 @@
               "title": "Tier",
               "type": "string"
             },
-            "storage:date_stored": {
-              "title": "Date Stored",
-              "type": "string",
-              "format": "date-time"
-            },
             "storage:min_tier_duration": {
               "title": "Minimum Duration for Tier",
               "type": "integer",