[ArduinoJson] Update external library ArduinoJson.

Is needed to compile new ESP32 code.

lib/ArduinoJson/examples/JsonParserExample/JsonParserExample.ino

@@ -1,29 +1,27 @@
-// Copyright Benoit Blanchon 2014-2016
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
 // MIT License
 //
-// Arduino JSON library
-// https://github.com/bblanchon/ArduinoJson
-// If you like this project, please add a star!
+// This example shows how to deserialize a JSON document with ArduinoJson.
 
 #include <ArduinoJson.h>
 
 void setup() {
+  // Initialize serial port
   Serial.begin(9600);
-  while (!Serial) {
-    // wait serial port initialization
-  }
+  while (!Serial) continue;
 
   // Memory pool for JSON object tree.
   //
-  // Inside the brackets, 200 is the size of the pool in bytes,
-  // If the JSON object is more complex, you need to increase that value.
+  // Inside the brackets, 200 is the size of the pool in bytes.
+  // Don't forget to change this value to match your JSON document.
+  // Use arduinojson.org/assistant to compute the capacity.
   StaticJsonBuffer<200> jsonBuffer;
 
   // StaticJsonBuffer allocates memory on the stack, it can be
   // replaced by DynamicJsonBuffer which allocates in the heap.
-  // It's simpler but less efficient.
   //
-  // DynamicJsonBuffer  jsonBuffer;
+  // DynamicJsonBuffer  jsonBuffer(200);
 
   // JSON input string.
   //
@@ -65,3 +63,16 @@ void setup() {
 void loop() {
   // not used in this example
 }
+
+// See also
+// --------
+//
+// The website arduinojson.org contains the documentation for all the functions
+// used above. It also includes an FAQ that will help you solve any
+// deserialization problem.
+// Please check it out at: https://arduinojson.org/
+//
+// The book "Mastering ArduinoJson" contains a tutorial on deserialization.
+// It begins with a simple example, like the one above, and then adds more
+// features like deserializing directly from a file or an HTTP request.
+// Please check it out at: https://arduinojson.org/book/