ArduinoJson 6.15.0 * Added `DeserializationOption::Filter` (issue #959) * Added example `JsonFilterExample.ino` * Changed the array subscript operator to automatically add missing elements * Fixed "deprecated-copy" warning on GCC 9 (fixes #1184) * Fixed `MemberProxy::set(char[])` not duplicating the string (issue #1191) * Fixed enums serialized as booleans (issue #1197) * Fixed incorrect string comparison on some platforms (issue #1198) * Added move-constructor and move-assignment to `BasicJsonDocument` * Added `BasicJsonDocument::garbageCollect()` (issue #1195) * Added `StaticJsonDocument::garbageCollect()` * Changed copy-constructor of `BasicJsonDocument` to preserve the capacity of the source. * Removed copy-constructor of `JsonDocument` (issue #1189)