App restore

[mg-twentyone]

Description

This PR restore the basic functionality and improve the list of fiat currencies.

What's new?

Changes:

• Update coindesk API
• Update requirements packages version
• Fix test flow
• Add new fiat currencies (CHF,HKD,CNY,SGD,TWD,THB,KRW,BRL,RUB,TRY)

Issue References

Fixes #5

Demo / Screenshots

[mg-twentyone]

@bitkarrot @asherp @amsalmeron are you available to review it when you have a chance?

[bitkarrot]

Merging, however vercel.json needs to be updated to :

{
"builds": [
{ "src": "src/app.py", "use": "@vercel/python" }
],
"routes": [
{ "src": "/(.*)", "dest": "src/app.py" }
],
"env": {
"LC_ALL": "C",
"LC_NUMERIC": "C",
"LANG": "C"
}
}