issue-495: Made TextField.textInset available in Obj-C

CHANGELOG.md

 ## 2.12.18
 
 * Fixed layout issues in CollectionView, where the sizing was not correctlly being initialized.
+* [issue-495](https://github.com/CosmicMind/Material/issues/495): Made TextField.textInset available in Obj-C.
 
 ## 2.12.17
 

Sources/iOS/TextField.swift

@@ -425,6 +425,7 @@ open class TextField: UITextField {
     }
 
     /// EdgeInsets for text.
+    @objc
     open var textInset: CGFloat = 0
 
     open override func textRect(forBounds bounds: CGRect) -> CGRect {