README.yubihsm.md: Redact dev YubiHSM 2 ID
Oops. Fortunately I don't think it's terribly sensitive.
@@ -311,7 +311,7 @@ The following command lists keys in the HSM:
```
$ tmkms yubihsm keys list
-Listing keys in YubiHSM #0007550072:
+Listing keys in YubiHSM #9876543211:
- #1: cosmosvalconspub1zcjduepqtvzxa733n7dhrjf247n0jtdwsvvsd4jgqvzexj5tkwerpzy5sugsvmfja3
```
