v1.4.0 for more control over mbed RP2040 LittleFS

### Major Releases v1.4.0

1. Permit more control over LittleFS for RP2040 Arduino mbed core, such as `FORCE_REFORMAT`, `MBED_RP2040_INITIALIZED`, `MRD_MBED_LITTLEFS_NEED_INIT`.

CONTRIBUTING.md

@@ -14,7 +14,7 @@ If you don't find anything, please [open a new issue](https://github.com/khoih-p
 
 Please ensure to specify the following:
 
-* Arduino IDE version (e.g. 1.8.13) or Platform.io version
+* Arduino IDE version (e.g. 1.8.15) or Platform.io version
 * `SAMD` Core Version (e.g. Arduino SAMD core v1.8.11, Adafruit SAMD core v1.7.2, Seeed Studio SAMD v1.8.1)
 * Contextual information (e.g. what you were trying to achieve)
 * Simplest possible steps to reproduce
@@ -26,10 +26,10 @@ Please ensure to specify the following:
 ### Example
 
 ```
-Arduino IDE version: 1.8.13
+Arduino IDE version: 1.8.15
 Arduino SAMD Core Version 1.8.11
 OS: Ubuntu 20.04 LTS
-Linux xy-Inspiron-3593 5.4.0-73-generic #82-Ubuntu SMP Wed Apr 14 17:39:42 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
+Linux xy-Inspiron-3593 5.4.0-74-generic #83-Ubuntu SMP Sat May 8 02:35:39 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
 
 Context:
 I encountered an endless loop while trying to connect to Local WiFi.