fix podspec

InterButton.podspec

@@ -3,12 +3,12 @@ Pod::Spec.new do |spec|
   spec.version      = "0.0.1"
   spec.summary      = "InterButton makes the button smaller when tapped."
   spec.homepage     = "https://github.com/yamajyn/InterButton"
-  spec.screenshots  = "https://github.com/yamajyn/InterButton/blob/main/Resources/screenshots_1.gif"
   spec.license      = { :type => "MIT", :file => "License.md" }
   spec.author    = "Junya Yamamoto"
   spec.social_media_url   = "https://twitter.com/yamajyn"
   spec.platform     = :ios, "14.0"
   spec.ios.deployment_target = "14.0"
+  spec.swift_versions = "4.0"
   spec.source       = { :git => "https://github.com/yamajyn/InterButton.git", :tag => "#{spec.version}" }
   spec.source_files  = "Classes", "InterButton/InterButton.swift"
 end