coerce boolean value using more commmon !!

lib/modules/blockchain_process/blockchain.js

@@ -316,7 +316,7 @@ Blockchain.prototype.initChainAndGetAddress = function(callback) {
 };
 
 var BlockchainClient = function(blockchainConfig, client, env, onReadyCallback, onExitCallback) {
-  const isDev = Boolean(blockchainConfig.isDev);
+  const isDev = !!blockchainConfig.isDev;
   // TODO add other clients at some point
   if (client === 'geth') {
     return new Blockchain({blockchainConfig, client: GethCommands, env, isDev, onReadyCallback, onExitCallback});