Updates .travis.yml

Author: simonmitchell

.travis.yml

@@ -1,11 +1,11 @@
 language: swift
 xcode_project: ThunderCollection.xcodeproj # path to your xcodeproj folder
-osx_image: xcode11
+osx_image: xcode12
 env:
   global:
   - LC_CTYPE=en_US.UTF-8
   - LANG=en_US.UTF-8
 matrix:
   include:
     - xcode_scheme: ThunderCollection
-      xcode_destination: platform=iOS Simulator,OS=13.0,name=iPhone 11 Pro Max
+      xcode_destination: platform=iOS Simulator,OS=14.0,name=iPhone 11 Pro Max