Merge remote-tracking branch 'origin/dev' into rfb/refactoring

.travis.yml

@@ -5,6 +5,7 @@ python:
 cache:
   directories:
     - ~/.npm
+    - ~/.platformio
 env:
   global:
     - BUILDER_TOTAL_THREADS=4

code/espurna/migrate.cpp

@@ -46,7 +46,7 @@ void migrate() {
 
     if (!version) return;
 
-    switch (migrateVersion()) {
+    switch (version) {
         // migrate old version with 1-based indices
         case 2:
             _cmpMoveIndexDown("ledGPIO");

code/platformio.ini

@@ -34,10 +34,6 @@ extra_configs =
 #   arduino core 2.7.1 = espressif8266@2.5.3 (platform)
 #   arduino core 2.7.4 = espressif8266@2.6.2 (platform_latest)
 #
-# Arduino Core 2.3.0:
-#   "Error: Development platform 'espressif8266' is not compatible with PlatformIO Core v4.4.0-b.1 and depends on PlatformIO Core ^3.0.0"
-#   ref. https://docs.platformio.org/en/latest/core/history.html
-#
 # ------------------------------------------------------------------------------
 
 platform = espressif8266@2.5.3