bug fix, public init created

Author: FesenkoG

web3swift/BlockExplorer/Classes/BlockExplorer.swift

@@ -9,5 +9,9 @@
 import Foundation
 
 public class BlockExplorer {
-    public var urlStringList = "https://scan.bankex.com/api/list"
+    public var urlStringList: String
+    
+    public init() {
+        urlStringList = "https://scan.bankex.com/api/list"
+    }
 }