Further rate limit login

src/anonchat/routes.py

@@ -139,6 +139,7 @@ def admin_login():
     return render_template('admin_login.html', error=error)
 
 @app.route('/admin', methods=['POST'])
+@limiter.limit("1 per minute")
 @limiter.limit("10 per hour")
 def admin_login_post():
     error = None