Update ESP32 build image to 3.3-r4

rojer · rojer · commit 95b1ff7c3384 · 2020-02-11T22:37:16.000Z
Fix reading flash parameters from encrypted flash

CL: none
diff --git a/platforms/esp32/sdk.version b/platforms/esp32/sdk.version
@@ -1 +1 @@
-docker.io/mgos/esp32-build:3.3-r3
+docker.io/mgos/esp32-build:3.3-r4
