Freeze compatiable dependencies versions.

Cartfile

@@ -1,5 +1,5 @@
-github "attaswift/BigInt" ~> 5.3.0
-github "attaswift/SipHash" ~> 1.2.2
-github "daltoniam/Starscream" ~> 4.0.4
-github "krzyzanowskim/CryptoSwift" ~> 1.4.2
-github "mxcl/PromiseKit" ~> 6.16.2
+github "attaswift/BigInt" == 5.3.0
+github "attaswift/SipHash" == 1.2.2
+github "daltoniam/Starscream" == 4.0.4
+github "krzyzanowskim/CryptoSwift" == 1.5.1
+github "mxcl/PromiseKit" == 6.16.2

Package.resolved

@@ -15,17 +15,17 @@
         "repositoryURL": "https://github.com/krzyzanowskim/CryptoSwift.git",
         "state": {
           "branch": null,
-          "revision": "12f2389aca4a07e0dd54c86ec23d0721ed88b8db",
-          "version": "1.4.3"
+          "revision": "039f56c5d7960f277087a0be51f5eb04ed0ec073",
+          "version": "1.5.1"
         }
       },
       {
         "package": "PromiseKit",
         "repositoryURL": "https://github.com/mxcl/PromiseKit.git",
         "state": {
           "branch": null,
-          "revision": "3fd8c77ded8a4bbee548e3bd6c987ffe8c1e3574",
-          "version": "6.17.0"
+          "revision": "7b07b214dacecb22ca4b680531c7e981d52483f9",
+          "version": "6.16.3"
         }
       },
       {

Package.swift

@@ -21,10 +21,10 @@ let package = Package(
     ],
 
     dependencies: [
-        .package(url: "https://github.com/attaswift/BigInt.git", from: "5.3.0"),
-        .package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.16.2"),
-        .package(url: "https://github.com/daltoniam/Starscream.git", from: "4.0.4"),
-        .package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", .exact("1.4.3"))
+        .package(url: "https://github.com/attaswift/BigInt.git", .upToNextMinor(from: "5.3.0")),
+        .package(url: "https://github.com/mxcl/PromiseKit.git", .upToNextMinor(from: "6.16.2")),
+        .package(url: "https://github.com/daltoniam/Starscream.git", .upToNextMinor(from: "4.0.4")),
+        .package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", .upToNextMinor(from: "1.5.1"))
     ],
     targets: [
         .target(name: "secp256k1"),

web3swift.podspec

@@ -13,9 +13,9 @@ Pod::Spec.new do |spec|
     spec.resource_bundle = { "Browser" => "Sources/web3swift/Browser/*.js" }
     spec.swift_version = '5.0'
     spec.frameworks = 'CoreImage'
-    spec.dependency 'BigInt', '~> 5.2.0'
-    spec.dependency 'Starscream', '~> 4.0.4'
-    spec.dependency 'CryptoSwift', '~> 1.4.2'
+    spec.dependency 'BigInt', '== 5.2.0'
+    spec.dependency 'Starscream', '== 4.0.4'
+    spec.dependency 'CryptoSwift', '== 1.4.3'
     spec.dependency 'secp256k1.c', '~> 0.1'
-    spec.dependency 'PromiseKit', '~> 6.15.3'
+    spec.dependency 'PromiseKit', '== 6.15.3'
 end