Remove int constraint on delay

This allows the delay endpoint to accept floats as delay values.

httpbin/core.py

@@ -438,7 +438,7 @@ def digest_auth(qop=None, user='user', passwd='passwd'):
     return jsonify(authenticated=True, user=user)
 
 
-@app.route('/delay/<int:delay>')
+@app.route('/delay/<delay>')
 def delay_response(delay):
     """Returns a delayed response"""
     delay = min(delay, 10)
@@ -448,6 +448,7 @@ def delay_response(delay):
     return jsonify(get_dict(
         'url', 'args', 'form', 'data', 'origin', 'headers', 'files'))
 
+
 @app.route('/drip')
 def drip():
     """Drips data over a duration after an optional initial delay."""