update Web3Core.spec source file path

Author: zhangliugang

Web3Core.podspec

@@ -15,5 +15,5 @@ Pod::Spec.new do |spec|
     spec.dependency 'secp256k1.c', '~> 0.1'
     spec.dependency 'BigInt', '~> 5.2.0' # no newer version in pods.
     spec.dependency 'CryptoSwift', '~> 1.5.1'
-    spec.source_files = "Sources/Core/**/*.swift"
+    spec.source_files = "Sources/Web3Core/**/*.swift"
 end