More platforms' support, upgraded gradle kotlin deps

macos/Classes/ModalProgressHudNsnPlugin.swift

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+import Cocoa
+import FlutterMacOS
+
+public class ModalProgressHudNsnPlugin: NSObject, FlutterPlugin {
+  public static func register(with registrar: FlutterPluginRegistrar) {
+    let channel = FlutterMethodChannel(name: "modal_progress_hud_nsn", binaryMessenger: registrar.messenger)
+    let instance = ModalProgressHudNsnPlugin()
+    registrar.addMethodCallDelegate(instance, channel: channel)
+  }
+
+  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+    switch call.method {
+    case "getPlatformVersion":
+      result("macOS " + ProcessInfo.processInfo.operatingSystemVersionString)
+    default:
+      result(FlutterMethodNotImplemented)
+    }
+  }
+}

macos/modal_progress_hud_nsn.podspec

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+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint modal_progress_hud_nsn.podspec` to validate before publishing.
+#
+Pod::Spec.new do |s|
+  s.name             = 'modal_progress_hud_nsn'
+  s.version          = '0.0.1'
+  s.summary          = 'A new flutter plugin project.'
+  s.description      = <<-DESC
+A new flutter plugin project.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => 'email@example.com' }
+  s.source           = { :path => '.' }
+  s.source_files     = 'Classes/**/*'
+  s.dependency 'FlutterMacOS'
+
+  s.platform = :osx, '10.11'
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }
+  s.swift_version = '5.0'
+end