Move swift version to podspec

ReactiveLocation.podspec

@@ -1,42 +1,16 @@
-#
-# Be sure to run `pod lib lint ReactiveLocation.podspec' to ensure this is a
-# valid spec before submitting.
-#
-# Any lines starting with a # are optional, but their use is encouraged
-# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
-#
-
 Pod::Spec.new do |s|
   s.name             = 'ReactiveLocation'
-  s.version          = '3.1.0'
+  s.version          = '3.1.1'
   s.summary          = 'Simple yet powerful wrapper of CLLocationManager for ReactiveCocoa'
-
-# This description is used to generate tags and improve search results.
-#   * Think: What does it do? Why did you write it? What is the focus?
-#   * Try to keep it short, snappy and to the point.
-#   * Write the description between the DESC delimiters below.
-#   * Finally, don't worry about the indent, CocoaPods strips it!
-
   s.description      = <<-DESC
 Simple yet powerful wrapper of CLLocationManager for ReactiveCocoa. With support of requestim permissions and obtaiining user's location. Heading, Regions and Visits.
 DESC
-
   s.homepage         = 'https://github.com/AckeeCZ/ReactiveLocation'
-  # s.screenshots     = 'www.example.com/screenshots_1', 'www.example.com/screenshots_2'
   s.license          = { :type => 'MIT', :file => 'LICENSE' }
   s.author           = { 'Ackee' => 'info@ackee.cz' }
   s.source           = { :git => 'https://github.com/AckeeCZ/ReactiveLocation.git', :tag => s.version.to_s }
-  # s.social_media_url = 'https://twitter.com/<TWITTER_USERNAME>'
-
   s.ios.deployment_target = '8.0'
-
   s.source_files = 'ReactiveLocation/*.swift'
-
-  # s.resource_bundles = {
-  #   'ReactiveLocation' => ['ReactiveLocation/Assets/*.png']
-  # }
-
-  # s.public_header_files = 'Pod/Classes/**/*.h'
-  # s.frameworks = 'UIKit', 'MapKit'
   s.dependency 'ReactiveSwift', '~> 4.0'
+  s.swift_version    = '4.0'
 end