2021-05-23 bitCNY minimum_feeds adjusted from 1 to 3

[abit]

2021-05-23 bitCNY minimum_feeds adjusted from 1 to 3 for better redundancy.

Current parameters:

ICR (Initial collateral ratio) 300%
MCR (Maintenance collateral ratio) 160%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
Minimum feeds 3
Price feed producers list:
1.2.183     hiquanta
1.2.35248   in.abit
1.2.420186  clone (yexiao)
1.2.987999  zapata42-witness
1.2.1031601 btspp-witness

Borrowing is enabled. The maximum supply is limited to 30,000,000 bitCNY.
Force-settlement is disabled.