use PUT for routing options

src/c3nav/site/static/site/js/c3nav.js

@@ -818,7 +818,7 @@ c3nav = {
             options[$(this).attr('name')] = $(this).val();
         });
         if ($(this).is('.save')) {
-            c3nav_api.post('routing/options', options);
+            c3nav_api.put('routing/options', options);
         }
         c3nav.next_route_options = options;
         c3nav.update_state(null, null, null, false);

src/c3nav/static/c3nav/js/api.js

@@ -60,6 +60,20 @@
             })
                 .then(res => res.json())
         }
+
+        put(path, data) {
+            return fetch(this.make_url(path), {
+                credentials: 'include',
+                method: 'PUT',
+                headers: {
+                    'X-API-Key': this.key,
+                    'Accept': 'application/json',
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify(data),
+            })
+                .then(res => res.json())
+        }
     }
 
     window.c3nav_api = new C3NavApi(`${window.location.origin}/api/v2/`);