Added note for OLED library version

Author: squix78

README.md

@@ -11,9 +11,9 @@ At the time of this writing **1.6.6 and 1.6.7 are not supported**!
 ## Setup
 
 * Install the following librarys with your Arduino Library Manager in Sketch > Include Library > Manage Libraries...
- * ESP8266 Weather Station
+ * ESP8266 Weather Station 
  * Json Streaming Parser (by Daniel Eichhorn)
- * ESP8266 Oled Driver for SSD1306 display (by me as well)
+ * ESP8266 Oled Driver for SSD1306 display (by me as well). **Make sure that you use Version 2.0.0 or bigger!**
 * Go to http://wunderground.com, create an account and get an API Key
 * In the Arduino IDE go to File > Examples > ESP8266 Weather Station
  * Enter  the Wunderground API Key