Updated pod spec with protobuf deps and settings

GTXiLib.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "GTXiLib"
-  s.version      = "4.0"
+  s.version      = "4.1"
   s.summary      = "iOS Accessibility testing library."
   s.description  = <<-DESC
   iOS Accessibility testing library that works with XCTest based frameworks.
@@ -9,7 +9,9 @@ Pod::Spec.new do |s|
   s.license      = "Apache License 2.0"
   s.author       = "j-sid"
   s.platform     = :ios
-  s.source       = { :git => "https://github.com/google/GTXiLib.git", :tag => "4.0.0" }
+  s.source       = { :git => "https://github.com/google/GTXiLib.git", :tag => "4.1.0" }
   s.source_files = "Classes/**/*.{h,m,swift}"
-  s.dependency 'Protobuf-C++'
+  s.ios.deployment_target = '9.0'
+  s.libraries = 'c++'
+  s.dependency 'Protobuf'
 end