fix build. platformio isn't smart enough to git pull latest without

specifying a tag/commit/etc (I haven't tried specifying a branch?)

Without specifying the hash, the build breaks for anyone who already had
a repo (the CI build doesn't see this because it always pulls from scratch)

cc @crossan007 & @mc-hamster

platformio.ini

@@ -65,7 +65,7 @@ debug_tool = jlink
 ;  monitor adapter_khz 10000
 
 lib_deps =
-  https://github.com/meshtastic/esp8266-oled-ssd1306.git ; ESP8266_SSD1306 
+  https://github.com/meshtastic/esp8266-oled-ssd1306.git#35d796226b853b0c0ff818b2f1aa3d35e7296a96 ; ESP8266_SSD1306 
   https://github.com/geeksville/OneButton.git ; OneButton library for non-blocking button debounce
   1202 ; CRC32, explicitly needed because dependency is missing in the ble ota update lib
   https://github.com/meshtastic/arduino-fsm.git#2f106146071fc7bc620e1e8d4b88dc4e0266ce39