Update podspec and add iOS 13.0 dep

FortuneWheel.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'FortuneWheel'
-  s.version          = '0.1.2'
+  s.version          = '0.1.4'
   s.summary          = 'Fortune spinning wheel library built using SwiftUI, supports dynamic content'
 
 # This description is used to generate tags and improve search results.

Sources/FortuneWheel/FortuneWheel.swift

@@ -57,6 +57,7 @@ public struct FortuneWheel: View {
     }
 }
 
+@available(iOS 13.0, *)
 extension Color {
 
     static let spin_wheel_color: [Color] = [Color(hex: "FBE488"), Color(hex: "75AB53"), Color(hex: "D1DC59"),

Sources/FortuneWheel/FortuneWheelViewModel.swift

@@ -7,6 +7,7 @@
 
 import SwiftUI
 
+@available(iOS 13.0, *)
 class FortuneWheelViewModel: ObservableObject {
 
     var titles: [String]

Sources/FortuneWheel/SpinWheel/SpinWheelCell.swift

@@ -7,6 +7,7 @@
 
 import SwiftUI
 
+@available(iOS 13.0, *)
 struct SpinWheelCell: Shape {
 
     let startAngle: Double, endAngle: Double

Sources/FortuneWheel/SpinWheel/SpinWheelView.swift

@@ -7,6 +7,7 @@
 
 import SwiftUI
 
+@available(iOS 13.0, *)
 struct Triangle: Shape {
     public func path(in rect: CGRect) -> Path {
         var path = Path()
@@ -19,6 +20,7 @@ struct Triangle: Shape {
     }
 }
 
+@available(iOS 13.0, *)
 struct SpinWheelPointer: View {
     var pointerColor: Color
     var body: some View {
@@ -29,6 +31,7 @@ struct SpinWheelPointer: View {
     }
 }
 
+@available(iOS 13.0, *)
 struct SpinWheelBolt: View {
     var body: some View {
         ZStack {
@@ -41,6 +44,7 @@ struct SpinWheelBolt: View {
     }
 }
 
+@available(iOS 13.0, *)
 struct SpinWheelView: View {
 
     var data: [Double], labels: [String]