Update to version 2.1.0 and improvement of asynchronous HTTP request management

Author: playmiel

library.json

@@ -1,6 +1,6 @@
 {
   "name": "ESPAsyncWebClient",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "Asynchronous HTTP client library for ESP32 ",
   "keywords": [
     "http",

library.properties

@@ -1,5 +1,5 @@
 name=ESPAsyncWebClient
-version=2.0.0
+version=2.1.0
 author=playmiel
 maintainer=playmiel
 sentence=Asynchronous HTTP client library for ESP32 microcontrollers

platformio.ini

@@ -12,11 +12,9 @@ build_flags =
     -DCORE_DEBUG_LEVEL=3
 
 [env:esp32dev]
-platform = espressif32
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
 board = esp32dev
 framework = arduino
-platform_packages =
-    framework-arduinoespressif32@^3
 build_src_filter = -<*> +<../src/> +<../test/compile_test_internal/compile_test.cpp>
 ; Run only Arduino-suitable tests on the device build
 test_filter = test_parse_url, test_chunk_parse, test_keep_alive, test_cookies, test_redirects
@@ -27,11 +25,9 @@ lib_deps =
 
 # Environment for testing compilation without networking
 [env:compile_test]
-platform = espressif32
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
 board = esp32dev
 framework = arduino
-platform_packages =
-    framework-arduinoespressif32@^3
 build_flags = 
     ${env.build_flags}
     -DCOMPILE_TEST_ONLY
@@ -40,11 +36,9 @@ lib_deps =
     ESP32Async/AsyncTCP @ ^3.4.8
 
 [env:compile_test_gzip]
-platform = espressif32
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
 board = esp32dev
 framework = arduino
-platform_packages =
-    framework-arduinoespressif32@^3
 build_flags =
     ${env.build_flags}
     -DCOMPILE_TEST_ONLY
@@ -56,11 +50,9 @@ lib_deps =
 
 # Environment for testing with different AsyncTCP versions
 [env:esp32dev_asynctcp_dev]
-platform = espressif32
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
 board = esp32dev
 framework = arduino
-platform_packages =
-    framework-arduinoespressif32@^3
 build_flags = 
     ${env.build_flags}
     -DTEST_ASYNCTCP_DEV
@@ -71,11 +63,9 @@ lib_deps =
 
 # Environment for testing with AsyncTCP stable version
 [env:test_asynctcp_stable]
-platform = espressif32
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip
 board = esp32dev
 framework = arduino
-platform_packages =
-    framework-arduinoespressif32@^3
 build_flags = 
     ${env.build_flags}
     -DTEST_ASYNCTCP_STABLE