Updated Bag of Tricks (markdown)

Bag-of-Tricks.md

@@ -41,3 +41,37 @@ root.printTo(BufferedPrint<256>(Serial));
 
 See issue [#166](https://github.com/bblanchon/ArduinoJson/issues/166).
 
+## Chunked output
+
+Here is a proxy that allow to get only part of the output:
+
+```c++
+class ChunkPrint : public Print {
+ public:
+  ChunkPrint(Print& destination, size_t from, size_t to)
+      : _destination(destination), _to_skip(from), _to_write(to - from) {}
+
+  virtual size_t write(uint8_t c) {
+    if (_to_skip > 0) {
+      _to_skip--;
+    } else if (_to_write > 0) {
+      _to_write--;
+      return _destination.write(c);
+    }
+    return 0;
+  }
+
+ private:
+  Print& _destination;
+  size_t _to_skip;
+  size_t _to_write;
+};
+```
+
+To use this in your code:
+
+```c++
+root.printTo(ChunkPrint(Serial,10,20)); // print only range [10,20[
+```
+
+See issue [#206](https://github.com/bblanchon/ArduinoJson/issues/206).