Feature/ropsten (#370)

* Refactoring AddLiquidity to make gasLimit computation more clear

src/pages/Pool/AddLiquidity.js

@@ -362,6 +362,7 @@ export default function AddLiquidity() {
     })
 
     const deadline = Math.ceil(Date.now() / 1000) + DEADLINE_FROM_NOW
+
     const estimatedGasLimit = await exchangeContract.estimate.addLiquidity(
       isNewExchange ? ethers.constants.Zero : liquidityTokensMin,
       isNewExchange ? outputValueParsed : outputValueMax,
@@ -371,6 +372,8 @@ export default function AddLiquidity() {
       }
     )
 
+    const gasLimit = calculateGasMargin(estimatedGasLimit, GAS_MARGIN)
+
     exchangeContract
       .addLiquidity(
         isNewExchange ? ethers.constants.Zero : liquidityTokensMin,
@@ -378,7 +381,7 @@ export default function AddLiquidity() {
         deadline,
         {
           value: inputValueParsed,
-          gasLimit: calculateGasMargin(estimatedGasLimit, GAS_MARGIN)
+          gasLimit
         }
       )
       .then(response => {