issue-911: Added @objc to TabBar.tabItems for visibility in Obj-C.

Material.podspec

 Pod::Spec.new do |s|
 	s.name = 'Material'
-	s.version = '2.12.0'
+	s.version = '2.12.1'
 	s.license = 'BSD-3-Clause'
 	s.summary = 'A UI/UX framework for creating beautiful applications.'
 	s.homepage = 'http://materialswift.com'

Sources/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>2.12.0</string>
+	<string>2.12.1</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

Sources/iOS/TabBar.swift

@@ -200,6 +200,7 @@ open class TabBar: Bar {
     }
     
     /// TabItems.
+    @objc
     open var tabItems = [TabItem]() {
         didSet {
             for b in oldValue {
@@ -287,6 +288,7 @@ fileprivate extension TabBar {
     /// Prepares the tabItems.
     func prepareTabItems() {
         shouldNotAnimateLineView = true
+        
         for v in tabItems {
             v.grid.columns = 0
             v.contentEdgeInsets = .zero