Fix bump function: round to lower when BigNumber stores float value before converting to ethers BigNumber

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tornado/tornado-oracles",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "description": "Gas oracle for Tornado-specific transactions",
   "main": "./lib/index.js",
   "types": "./lib/index.d.ts",

src/utils.ts

@@ -25,6 +25,7 @@ export function bump(value: BigNumberish, percent: number): BigNumber {
     BigNumberFloat(BigNumber.from(value).toHexString())
       .times(hundredPercents.plus(BigNumberFloat(percent)))
       .div(hundredPercents)
+      .decimalPlaces(0, 1)
       .toString(),
   );
 }