.cache\wal\colos.json generated with broken json on Windows

[npdev453]

On windows pywal gen incorrect unparsable json for colors.json
example:

{
    "wallpaper": "C:\Users\np\AppData\Local\Temp\2.jpg",
    "alpha": "100",
}

what should to be:

{
    "wallpaper": "C:\\Users\\np\\AppData\\Local\\Temp\\2.jpg",
    "alpha": "100",
}

[npdev453]

possible fix
#564

but I`m not fluent in python, imm json should be serialized correctly before it exported to file (in Node.js its JSON.stringify)

[npdev453]

Seems to be fixed