119 minutes is returned instead of 181 minutes if confirmations is 0 for _getProofPeriod (openintentsframework#20)

Author: reednaa

src/oracles/bitcoin/BitcoinOracle.sol

@@ -108,7 +108,7 @@ contract BitcoinOracle is BaseOracle {
  /**
  * @notice Returns the number of seconds required to reach confirmation with 99.9%
  * certainty.
- * @dev confirmations == 0 returns 181 minutes.
+ * @dev confirmations == 0 returns 119 minutes.
  * @param confirmations Current block height - inclusion block height + 1.
  * @return Expected time to reach the confirmation with 99,9% certainty.
  */