Set the default board to d1_mini

platformio.ini

@@ -8,8 +8,8 @@
 ; Please visit documentation for the other options and examples
 ; http://docs.platformio.org/page/projectconf.html
 ; default environmen. Default to ProMicro 5V version.
-#[platformio]
-#default_envs = d1_mini
+[platformio]
+default_envs = d1_mini
 
 [common]
 framework = arduino