PayU / prometheus-api-metrics / 73 / 5

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Fix type error

Trying to add metrics in EtherPad, I've been hitting with the following error:

```
03:53:51 0|front       | ^[[32m[2020-07-19 03:53:51.659] [INFO] console - ^[[39m/\/javascripts\/(.*)/ { fast_star: false, fast_slash: false }
03:53:51 0|front       | TypeError: route.split is not a function
03:53:51 0|front       |     at ExpressMiddleware._getRoute (/opt/app-root/src/node_modules/prometheus-api-metrics/src/express-middleware.js:69:45)
03:53:51 0|front       |     at ExpressMiddleware._handleResponse (/opt/app-root/src/node_modules/prometheus-api-metrics/src/express-middleware.js:37:2
03:53:51 0|front       |     at ServerResponse.<anonymous> (/opt/app-root/src/node_modules/prometheus-api-metrics/src/express-middleware.js:129:18)
03:53:51 0|front       |     at Object.onceWrapper (events.js:421:28)
03:53:51 0|front       |     at ServerResponse.emit (events.js:327:22)
03:53:51 0|front       |     at ServerResponse.EventEmitter.emit (domain.js:482:12)
03:53:51 0|front       |     at onFinish (_http_outgoing.js:723:10)
03:53:51 0|front       |     at onCorkedFinish (_stream_writable.js:673:5)
03:53:51 0|front       |     at afterWrite (_stream_writable.js:490:5)
03:53:51 0|front       |     at afterWriteTick (_stream_writable.js:477:10)
03:53:51 0|front       | ^[[31m[2020-07-19 03:53:51.661] [ERROR] console - ^[[39mTypeError: route.split is not a function
03:53:51 0|front       |     at ExpressMiddleware._getRoute (/opt/app-root/src/node_modules/prometheus-api-metrics/src/express-middleware.js:69:45)
03:53:51 0|front       |     at ExpressMiddleware._handleResponse (/opt/app-root/src/node_modules/prometheus-api-metrics/src/express-middleware.js:37:2
03:53:51 0|front       |     at ServerResponse.<anonymous> (/opt/app-root/src/node_modules/prometheus-api-metrics/src/express-middleware.js:129:18)
03:53:51 0|front       |     at Object.onceWrapper (events.js:421:28)
03:53:51 0|front       |     at ServerResponse.emit (e... (continued)

162 of 164 branches covered (98.78%)

Branch coverage included in aggregate %.

199 of 199 relevant lines covered (100.0%)

28.29 hits per line