[Sources] [RSKGrowingTextView] Handle `UITextView.textDidChangeNotifi…

…cation`.

Fixes #18.

RSKGrowingTextView/RSKGrowingTextView.swift

@@ -180,6 +180,11 @@ public typealias HeightChangeUserActionsBlockType = ((_ oldHeight: CGFloat, _ ne
 
     // MARK: - Object Lifecycle
 
+    deinit {
+
+        NotificationCenter.default.removeObserver(self, name: UITextView.textDidChangeNotification, object: self)
+    }
+
     required public init?(coder aDecoder: NSCoder) {
         calculationLayoutManager.addTextContainer(calculationTextContainer)
         super.init(coder: aDecoder)
@@ -192,6 +197,13 @@ public typealias HeightChangeUserActionsBlockType = ((_ oldHeight: CGFloat, _ ne
         commonInitializer()
     }
 
+    // MARK: - Actions
+
+    @objc private func handleRSKGrowingTextViewTextDidChangeNotification(_ notification: Notification) {
+
+        refreshHeightIfNeededAnimated(animateHeightChange)
+    }
+
     // MARK: - Private API
 
     private func commonInitializer() {
@@ -206,6 +218,8 @@ public typealias HeightChangeUserActionsBlockType = ((_ oldHeight: CGFloat, _ ne
                 break
             }
         }
+
+        NotificationCenter.default.addObserver(self, selector: #selector(RSKGrowingTextView.handleRSKGrowingTextViewTextDidChangeNotification(_:)), name: UITextView.textDidChangeNotification, object: self)
     }
 
     private func heightForNumberOfLines(_ numberOfLines: Int) -> CGFloat {