v1.4.0 to add support to ESP32-C3

### Releases v1.4.0

1. Add **LittleFS and SPIFFS** support to new **ESP32-S2** boards (**Arduino ESP32C3_DEV**). Check [HOWTO Install esp32 core for ESP32-S2 (Saola, AI-Thinker ESP-12K) and ESP32-C3 boards into Arduino IDE](#howto-install-esp32-core-for-esp32-s2-saola-ai-thinker-esp-12k-and-esp32-c3-boards-into-arduino-ide).
2. Add **EEPROM and SPIFFS** support to new **ESP32-C3** boards (**Arduino ESP32C3_DEV**). Check [HOWTO Install esp32 core for ESP32-S2 (Saola, AI-Thinker ESP-12K) and ESP32-C3 boards into Arduino IDE](#howto-install-esp32-core-for-esp32-s2-saola-ai-thinker-esp-12k-and-esp32-c3-boards-into-arduino-ide).

Author: khoih-prog

README.md

@@ -275,7 +275,7 @@ As of **April 16th 2021**, the **esp32-s2/c3** board support has been included i
 #### 2.3 Unzip
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/master/pics/esp32_s2_Core_Unzipped.png">
+    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/main/pics/esp32_s2_Core_Unzipped.png">
 </p>
 
 #### 2.4 Update esp32 core directories
@@ -296,7 +296,7 @@ For example `xtensa-esp32s2-elf-gcc8_4_0-esp-2020r3-linux-amd64.tar.gz`, then un
 
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/master/pics/esp32_s2_Toolchain.png">
+    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/main/pics/esp32_s2_Toolchain.png">
 </p>
 
 #### 3.2 Download esptool
@@ -309,7 +309,7 @@ Download [esptool](https://github.com/espressif/esptool/releases) int the `zip`
 #### 3.3 Unzip
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/master/pics/esp32_s2_esptool.png">
+    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/main/pics/esp32_s2_esptool.png">
 </p>
 
 ---
@@ -330,7 +330,7 @@ Copy whole `esptool` directory into `/home/your_account/.arduino15/packages/esp3
 
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/master/pics/esp32_s2_tools.png">
+    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/main/pics/esp32_s2_tools.png">
 </p>
 
 
@@ -353,7 +353,7 @@ Then using the similar steps as in
 then copy whole `riscv32-esp-elf` directory into `/home/your_account/.arduino15/packages/esp32/hardware/esp32/1.0.6/tools`
 
 <p align="center">
-    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/master/pics/ESP_WM_Lite_ESP32_C3_Support.png">
+    <img src="https://github.com/khoih-prog/ESP_WiFiManager_Lite/blob/main/pics/ESP_WM_Lite_ESP32_C3_Support.png">
 </p>
 
 
@@ -419,7 +419,7 @@ Please have a look at [**ESP_WiFiManager Issue 39: Not able to read analog port
 
 #### 3. ESP32 WiFi uses ADC2 for WiFi functions
 
-Look in file [**adc_common.c**](https://github.com/espressif/esp-idf/blob/master/components/driver/adc_common.c#L61)
+Look in file [**adc_common.c**](https://github.com/espressif/esp-idf/blob/main/components/driver/adc_common.c#L61)
 
 > In ADC2, there're two locks used for different cases:
 > 1. lock shared with app and Wi-Fi: