Updated major version of Promise Kit, Big INt

Author: RaviRanjan-11

Package.resolved

@@ -14,10 +14,10 @@ let package = Package(
     ],
 
     dependencies: [
-        .package(url: "https://github.com/attaswift/BigInt.git", from: "5.2.0"),
-        .package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.15.3"),
+        .package(url: "https://github.com/attaswift/BigInt.git", from: "5.3.0"),
+        .package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.15.4"),
         .package(url: "https://github.com/daltoniam/Starscream.git", from: "4.0.4"),
-        .package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", from: "1.4.0"),
+        .package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", from: "1.4.2"),
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.