Update the Podspec for the 1.5.0-rc.1

Swifter.podspec

@@ -1,15 +1,15 @@
 Pod::Spec.new do |s|
 
   s.name                  = "Swifter"
-  s.version               = "1.4.7"
+  s.version               = "1.5.0-rc.1"
   s.summary               = "Tiny http server engine written in Swift programming language."
   s.homepage              = "https://github.com/glock45/swifter"
   s.license               = { :type => 'Copyright', :file => 'LICENSE' }
   s.author                = { "Damian Kołakowski" => "[email protected]" }
-  s.ios.deployment_target = "8.0"
+  s.ios.deployment_target = "9.0"
   s.osx.deployment_target = "10.10"
   s.tvos.deployment_target = "9.0"
-  s.source                = { :git => "https://github.com/httpswift/swifter.git", :tag => "1.4.7" }
+  s.source                = { :git => "https://github.com/httpswift/swifter.git", :tag => "1.5.0-rc.1" }
   s.source_files          = 'XCode/Sources/*.{swift}'
   s.swift_version         = '4.2'