update to Arduino IDE 1.8.19 for testing and dropped testing with 1.6.13

Author: Links2004

.github/workflows/main.yml

@@ -36,16 +36,13 @@ jobs:
           echo -en "::set-output name=matrix::"
           echo -en "["
 
-          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.6.13 esp8266com:esp8266:generic:xtal=80
+          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.8.19 esp8266com:esp8266:generic:xtal=80,dbg=Serial1
           echo -en ","
 
-          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.6.13 esp8266com:esp8266:generic:xtal=80,dbg=Serial1
+          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.8.19 esp8266com:esp8266:generic:xtal=80,eesz=1M,FlashMode=qio,FlashFreq=80
           echo -en ","
 
-          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp8266 esp8266 1.8.15 esp8266com:esp8266:generic:xtal=80,eesz=1M,FlashMode=qio,FlashFreq=80
-          echo -en ","
-
-          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp32 esp32 1.8.15 espressif:esp32:esp32:FlashFreq=80
+          get_sketches_json_matrix arduino $GITHUB_WORKSPACE/examples/esp32 esp32 1.8.19 espressif:esp32:esp32:FlashFreq=80
 
           echo -en "]"
     outputs:
@@ -56,7 +53,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        IDE_VERSION: [1.8.15, 1.6.13]
+        IDE_VERSION: [1.8.19]
     env:
       IDE_VERSION: ${{ matrix.IDE_VERSION }}
 
@@ -99,7 +96,7 @@ jobs:
           get_core esp8266
 
       - name: download esp32
-        if: steps.cache_all.outputs.cache-hit != 'true' && matrix.IDE_VERSION != '1.6.13'
+        if: steps.cache_all.outputs.cache-hit != 'true'
         run: |
           source $GITHUB_WORKSPACE/travis/common.sh
           get_core esp32