Added support for visionOS by adding to #if os(iOS) || os(visionOS)

Sources/SwiftMath/MathRender/MTConfig.swift

@@ -8,7 +8,7 @@ import Foundation
 //  MIT license. See the LICENSE file for details.
 //
 
-#if os(iOS)
+#if os(iOS) || os(visionOS)
 
 import UIKit
 

Sources/SwiftMath/MathRender/MTMathImage.swift

@@ -7,7 +7,7 @@
 
 import Foundation
 
-#if os(iOS)
+#if os(iOS) || os(visionOS)
     import UIKit
 #endif
 
@@ -86,7 +86,7 @@ extension MTMathImage {
         let size = intrinsicContentSize
         layoutImage(size: size, displayList: displayList)
         
-        #if os(iOS)
+        #if os(iOS) || os(visionOS)
             let renderer = UIGraphicsImageRenderer(size: size)
             let image = renderer.image { rendererContext in
                 rendererContext.cgContext.saveGState()

Sources/SwiftMath/MathRender/MTMathListDisplay.swift

@@ -13,7 +13,7 @@ import SwiftUI
 
 func isIos6Supported() -> Bool {
     if !MTDisplay.initialized {
-#if os(iOS)
+#if os(iOS) || os(visionOS)
         let reqSysVer = "6.0"
         let currSysVer = UIDevice.current.systemVersion
         if currSysVer.compare(reqSysVer, options: .numeric) != .orderedAscending {
@@ -58,7 +58,7 @@ public class MTDisplay:NSObject {
     }
     
     /// For debugging. Shows the object in quick look in Xcode.
-#if os(iOS)
+#if os(iOS) || os(visionOS)
     func debugQuickLookObject() -> Any {
         let size = CGSizeMake(self.width, self.ascent + self.descent);
         UIGraphicsBeginImageContext(size);