Add support for escape sequence \'

Fixes #2124

src/ArduinoJson/Json/EscapeSequence.hpp

@@ -32,8 +32,8 @@ class EscapeSequence {
   }
 
  private:
-  static const char* escapeTable(bool excludeSolidus) {
-    return &"//\"\"\\\\b\bf\fn\nr\rt\t"[excludeSolidus ? 2 : 0];
+  static const char* escapeTable(bool isSerializing) {
+    return &"//''\"\"\\\\b\bf\fn\nr\rt\t"[isSerializing ? 4 : 0];
   }
 };