Describe the bug

Hi! I was looking to use the json interface but found that some of the json that ESP_WifiManager outputs is invalid.

Eg - it outputs on /scan:

{"Access_Points":[{'SSID':'UPC434892', 'Encryption':true, 'Quality':'98'}, {'SSID':'Horizon Wi-Free', 'Encryption':true, 'Quality':'66'}, {'SSID':'vodafone-602D', 'Encryption':true, 'Quality':'32'}]}

This is great except that single quotes aren't allowed in json - only double quotes

https://findanyanswer.com/does-json-allow-single-quotes

Steps to Reproduce

http://192.168.4.1/scan

Expected behavior

valid json returned

Actual behavior

invalid json returned

Debug and AT-command log (if applicable)

Screenshots

Information

Please ensure to specify the following:

ESP8266
Arduino 1.8.13

Thanks for such an amazing library