Update README.md

Author: tobiasschuerg

README.md

@@ -5,7 +5,7 @@ Library for NodeMcu / ESP8266 (and Arduino?) for sending measurements to an Infl
 ## Initialization
 ```cpp
  #define INFLUXDB_HOST "192.168.0.32"
- #define INFLUXDB_PORT "1337"
+ #define INFLUXDB_PORT 1337
  #define INFLUXDB_DATABASE "test"
  //if used with authentication
  #define INFLUXDB_USER "user"