Update WaterfallGrid.podspec

Author: paololeonardi

WaterfallGrid.podspec

@@ -12,7 +12,6 @@ Pod::Spec.new do |spec|
   spec.ios.deployment_target = "13.0"
   spec.osx.deployment_target = "10.15"
   spec.watchos.deployment_target = "6.0"
-  spec.visionos.deployment_target = "1.0"
   spec.tvos.deployment_target = "13.0"
 
   spec.swift_version = '5.9'