Default label color (#24)

* use `label` vs `black` as the default color

* fix swiftpm warning

Author: yqiang

Package.swift

@@ -12,8 +12,8 @@ let package = Package(
             targets: ["ResponsiveTextField"]),
     ],
     dependencies: [
-        .package(name: "SnapshotTesting", url: "https://github.com/pointfreeco/swift-snapshot-testing.git", from: "1.17.2"),
-        .package(name: "combine-schedulers", url: "https://github.com/pointfreeco/combine-schedulers.git", from: "1.0.2")
+        .package(url: "https://github.com/pointfreeco/swift-snapshot-testing.git", from: "1.17.2"),
+        .package(url: "https://github.com/pointfreeco/combine-schedulers.git", from: "1.0.2")
     ],
     targets: [
         .target(

Sources/ResponsiveTextField/ResponsiveTextField+EnvironmentValues.swift

@@ -24,7 +24,7 @@ extension ResponsiveTextField {
     }
 
     fileprivate struct TextColorKey: EnvironmentKey {
-        static let defaultValue: UIColor = .black
+        static let defaultValue: UIColor = .label
     }
 
     fileprivate struct TextAlignmentKey: EnvironmentKey {