implement update profile endpoint

README.md

@@ -74,6 +74,16 @@ curl -s \
     http://localhost:5000/users/login | jq
 ```
 
+```
+curl -s \
+    -D "/dev/stderr" \
+    -X POST \
+    -H "Content-Type: application/json" \
+    -H "Authorization: Bearer 22e6c5fc-8a5a-440e-b1f4-018deb9fd24e" \
+    -d '{"pronouns": "Herr Dr. Dr."}' \
+    http://localhost:5000/users/1/profile | jq
+```
+
 ```
 curl -s \
     -D "/dev/stderr" \