Fix esp32 board manager URL

Author: ianfixes

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 - Warnings about directory name mismatches are now based on proper comparison of strings
+- Now using the recommended "stable" URL for the `esp32` board family
 
 ### Security
 

misc/default.yml

@@ -16,7 +16,7 @@ packages:
   adafruit:samd:
     url: https://adafruit.github.io/arduino-board-index/package_adafruit_index.json
   esp32:esp32:
-    url: https://dl.espressif.com/dl/package_esp32_index.json
+    url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
 
 platforms: