Added CocoaPods support for all c libraries

web3swift.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
     spec.name         = 'web3swift'
-    spec.version      = '2.1.1'
+    spec.version      = '2.2.0'
     spec.ios.deployment_target = "8.0"
     spec.osx.deployment_target = "10.10"
     spec.tvos.deployment_target = "9.0"
@@ -9,10 +9,12 @@ Pod::Spec.new do |spec|
     spec.summary      = 'Web3 implementation in pure Swift for iOS, macOS, tvOS, watchOS and Linux'
     spec.homepage     = 'https://github.com/bankex/web3swift'
     spec.author       = 'Bankex Foundation'
-    spec.source       = { :git => 'https://github.com/bankex/web3swift.git', :tag => 'v' + String(spec.version) }
-    spec.source_files = 'Sources/web3swift/**/*.swift'
-    
+    spec.source       = { :git => 'https://github.com/bankex/web3swift.git', :branch => 'develop' }
+    spec.source_files = 'Sources/web3swift'
+
     spec.dependency 'PromiseKit', '~> 6.4'
     spec.dependency 'BigInt', '~> 3.1'
+    spec.dependency 'secp256k1.c', '~> 0.1'
+    spec.dependency 'keccak.c', '~> 0.1'
+    spec.dependency 'scrypt.c', '~> 0.1'
 end
-