Fixed build badge

Author: squix78

README.md

@@ -1,7 +1,7 @@
 # Build
 
-* Stable: [![Build Status](https://travis-ci.org/squix78/esp8266-weather-station.svg?branch=master)](https://travis-ci.org/squix78/esp8266-weather-station)
-* Development: [![Build Status](https://travis-ci.org/squix78/esp8266-weather-station.svg?branch=development)](https://travis-ci.org/squix78/esp8266-weather-station)
+* Stable: [![Build Status](https://api.travis-ci.org/squix78/esp8266-weather-station.svg?branch=master)](https://travis-ci.org/squix78/esp8266-weather-station)
+* Development: [![Build Status](https://api.travis-ci.org/squix78/esp8266-weather-station.svg?branch=development)](https://travis-ci.org/squix78/esp8266-weather-station)
 
 # esp8266-weather-station