ESP32 NVS library V1.4

V1.2

Fix bug ... malloc and free heap mem

V1.3

• getObject(String key, void* blob, size_t length); for loading struct data from NVS
• setBool(...) & getBool(...)

V1.4

cast bool to uint8_t in setBool(..)

ESP32 NVS library V1.1

add NVS.exists(key) function

ESP32 NVS library V1.0

A ESP32 NVS (Non-volatile storage) library

about NVS see at
https://esp-idf.readthedocs.io/en/v1.0/api/nvs_flash.html