Bug fix for running on M1 iOS simulator. (#398)

ios/fluttertoast.podspec

@@ -16,8 +16,7 @@ Toast Library for FLutter
   s.public_header_files = 'Classes/**/*.h'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
   s.dependency 'Flutter'
   s.dependency 'Toast'
   s.dependency 'Toast'
-  s.pod_target_xcconfig = { 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64'}
-  s.user_target_xcconfig = { 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64'}
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
   s.ios.deployment_target = '8.0'
   s.ios.deployment_target = '8.0'
 end
 end