Added option for whether the system automatically enables the Return key (#23)

- The default value for this property is false. If you set it to true,
  the keyboard disables the Return key when the text entry area contains
  no text. As soon as the user enters some text, the Return key is
  automatically enabled.

  https://developer.apple.com/documentation/uikit/uitextinputtraits/enablesreturnkeyautomatically

Author: wcwynn

Sources/ResponsiveTextField/ResponsiveTextField.swift

@@ -24,6 +24,9 @@ public struct ResponsiveTextField {
     /// some external state.
     let isSecure: Bool
 
+    /// Enables return key automatically.
+    let enablesReturnKeyAutomatically: Bool
+
     /// Can be used to programatically control the text field's first responder state.
     ///
     /// When the binding's wrapped value is set, it will cause the text field to try and become or resign first responder status
@@ -130,6 +133,7 @@ public struct ResponsiveTextField {
         placeholder: String?,
         text: Binding<String>,
         isSecure: Bool = false,
+        enablesReturnKeyAutomatically: Bool = false,
         adjustsFontForContentSizeCategory: Bool = true,
         firstResponderDemand: Binding<FirstResponderDemand?>? = nil,
         configuration: Configuration = .empty,
@@ -144,6 +148,7 @@ public struct ResponsiveTextField {
         self.text = text
         self.firstResponderDemand = firstResponderDemand
         self.isSecure = isSecure
+        self.enablesReturnKeyAutomatically = enablesReturnKeyAutomatically
         self.configuration = configuration
         self.adjustsFontForContentSizeCategory = adjustsFontForContentSizeCategory
         self.onFirstResponderStateChanged = onFirstResponderStateChanged
@@ -329,6 +334,7 @@ extension ResponsiveTextField: UIViewRepresentable {
         textField.text = text.wrappedValue
         textField.isEnabled = isEnabled
         textField.isSecureTextEntry = isSecure
+        textField.enablesReturnKeyAutomatically = enablesReturnKeyAutomatically
         textField.font = font
         textField.adjustsFontForContentSizeCategory = adjustsFontForContentSizeCategory
         textField.textColor = textColor
@@ -364,6 +370,7 @@ extension ResponsiveTextField: UIViewRepresentable {
     public func updateUIView(_ uiView: UITextField, context: Context) {
         uiView.isEnabled = isEnabled
         uiView.isSecureTextEntry = isSecure
+        uiView.enablesReturnKeyAutomatically = enablesReturnKeyAutomatically
         uiView.returnKeyType = returnKeyType
         uiView.text = text.wrappedValue
         uiView.textColor = textColor