Use single PIO manifest

Fixes: me-no-dev#223

Author: me-no-dev

espressif32_library.json

@@ -15,9 +15,15 @@
   "version": "1.1.0",
   "license": "LGPL-3.0",
   "frameworks": "arduino",
-  "platforms":"espressif",
-  "dependencies":
-  {
-    "name": "ESPAsyncTCP"
-  }
+  "platforms":"espressif8266, espressif32",
+  "dependencies": [
+    {
+      "name": "ESPAsyncTCP",
+      "platforms": "espressif8266"
+    },
+    {
+      "name": "AsyncTCP",
+      "platforms": "espressif32"
+    }    
+  ]
 }