update readme

README.md

@@ -143,12 +143,12 @@ ALTER TABLE keys
                   │  │                  ▲    │
                   └──┼──────────────────┬────┘
                      │                  │
-                     │2.Get Public Key  │5. Write Public Key encrypted master key
-                     │                  │
+                     │2.Get Temp-       │5. Write Public Key encrypted master key
+                     │  Public Key      │
                      ▼                  │
 
                    3. Decrypt encrypted master key by YubiKey
-                   4. Encrypt master key by Public Key
+                   4. Encrypt master key by Temp Public Key
                    ┌┬──────────────┐
                   ┌┼│ YubiKey      │
                   └┼│              │