Fix #466: add method `json.load()`
Fix #466: add method `json.load()`

brython-dev/brython,jonathanverner/brython,brython-dev/brython,Hasimir/brython,brython-dev/brython,kikocorreoso/brython,Hasimir/brython,jonathanverner/brython,jonathanverner/brython,Hasimir/brython,Hasimir/brython,jonathanverner/brython,kikocorreoso/brython,kikocorreoso/brython