mint: support for cost()

Author: theshadowagent

mint/web3.js

@@ -12,6 +12,8 @@ const getMintTx = ({ numberOfTokens, ref, tier, wallet }) => {
 const getMintPrice = async (tier) => {
     if (NFTContract.methods.price)
         return NFTContract.methods.price().call();
+    if (NFTContract.methods.cost) 
+        return NFTContract.methods.cost().call();
     return tier ?
         await NFTContract.methods.getPrice(tier).call() :
         await NFTContract.methods.getPrice().call();