fix Xcode 14.3 build errors

Podfile

@@ -1,12 +1,21 @@
 # Uncomment the next line to define a global platform for your project
 # platform :ios, '9.0'
+platform :osx, '10.13'
 
 target 'LeetDown' do
   # Comment the next line if you don't want to use dynamic frameworks
   use_frameworks!
 
   # Pods for LeetDown
   pod 'AFNetworking', '~> 4.0'
+end
 
-
+post_install do |pi|
+    pi.pods_project.targets.each do |t|
+        t.build_configurations.each do |config|
+            config.build_settings['MACOSX_DEPLOYMENT_TARGET'] = '10.13'
+        end
+    end
 end
+
+