v0.3.0

[0.3.0] - 2022-02-07

• Add EmergencyPriceFeed.

v0.2.2

[0.2.2] - 2021-12-28

• BandPriceFeed will revert if price not updated yet.

[0.2.1] - 2021-12-24

• Fix BandPriceFeed when the price feed haven't updated.

[0.2.0] - 2021-12-21

• Add BandPriceFeed.