fix xCode 12 error

Podfile

@@ -2,8 +2,8 @@ def import_pods
   pod 'Alamofire', '~> 4.7'
   pod 'Alamofire-Synchronous', '~> 4.0'
   pod "PromiseKit", "~> 6.0"
-  pod 'BigInt', '~> 3.0.1'
-  pod 'CryptoSwift', '~> 0.10.0'
+  pod 'BigInt', '~> 3.0'
+  pod 'CryptoSwift', '~> 1.0'
   pod 'Result', '~> 3.0.0'
   pod 'libsodium', :modular_headers => true
   pod 'secp256k1_ios', :git => 'https://github.com/shamatar/secp256k1_ios.git', :modular_headers => true
@@ -21,7 +21,7 @@ target 'web3swift-macOS' do
 end
 
 target 'web3swift-iOS' do
-  platform :ios, '9.0'
+  platform :ios, '12.0'
 #  use_frameworks!
   use_modular_headers! 
   import_pods
@@ -30,3 +30,13 @@ target 'web3swift-iOS' do
     inherit! :search_paths
   end
 end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    if ['Result-iOS'].include? target.name
+      target.build_configurations.each do |config|
+        config.build_settings['SWIFT_VERSION'] = '4.2'
+      end
+    end
+  end
+end

Podfile.lock

@@ -4,7 +4,7 @@ PODS:
     - Alamofire (~> 4.0)
   - BigInt (3.0.1):
     - SipHash (~> 1.2)
-  - CryptoSwift (0.10.0)
+  - CryptoSwift (1.3.2)
   - libsodium (1.0.12)
   - PromiseKit (6.3.0):
     - PromiseKit/CorePromise (= 6.3.0)
@@ -22,23 +22,24 @@ PODS:
 DEPENDENCIES:
   - Alamofire (~> 4.7)
   - Alamofire-Synchronous (~> 4.0)
-  - BigInt (~> 3.0.1)
-  - CryptoSwift (~> 0.10.0)
+  - BigInt (~> 3.0)
+  - CryptoSwift (~> 1.0)
   - libsodium
   - PromiseKit (~> 6.0)
   - Result (~> 3.0.0)
   - secp256k1_ios (from `https://github.com/shamatar/secp256k1_ios.git`)
 
 SPEC REPOS:
-  https://github.com/cocoapods/specs.git:
+  https://github.com/CocoaPods/Specs.git:
     - Alamofire
     - Alamofire-Synchronous
     - BigInt
-    - CryptoSwift
     - libsodium
     - PromiseKit
-    - Result
     - SipHash
+  trunk:
+    - CryptoSwift
+    - Result
 
 EXTERNAL SOURCES:
   secp256k1_ios:
@@ -53,13 +54,13 @@ SPEC CHECKSUMS:
   Alamofire: e4fa87002c137ba2d8d634d2c51fabcda0d5c223
   Alamofire-Synchronous: eedf1e6e961c3795a63c74990b3f7d9fbfac7e50
   BigInt: 8e8a52161c745cd3ab78e3dc346a9fbee51e6cf6
-  CryptoSwift: 6c778d69282bed3b4e975ff97a79d074f20bb011
+  CryptoSwift: 093499be1a94b0cae36e6c26b70870668cb56060
   libsodium: 9a8faa5ef2fa0d2d57bd7f7d79bf8fb7c1a9f0ea
   PromiseKit: cf84bbb1235a61473b326c5cf0b41f6828f87ba5
   Result: 1b3e431f37cbcd3ad89c6aa9ab0ae55515fae3b6
   secp256k1_ios: ac9ef04e761f43c58012b28548afa91493761f17
   SipHash: fad90a4683e420c52ef28063063dbbce248ea6d4
 
-PODFILE CHECKSUM: 223ac1f8c8d3680620ee14284487d604e8703b65
+PODFILE CHECKSUM: 273fddb1fa59f4420efd3946dfc867cf445b626f
 
-COCOAPODS: 1.5.3
+COCOAPODS: 1.9.3