Bump minimum Swift version to 5.1

Author: freak4pc

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.1
 
 import PackageDescription
 

RxBlocking.podspec

@@ -26,5 +26,5 @@ Waiting for observable sequence to complete before exiting command line applicat
   s.exclude_files         = 'RxBlocking/Platform/**/*.swift'
 
   s.dependency 'RxSwift', '~> 5'
-  s.swift_version = '5.0'
+  s.swift_version = '5.1'
 end

RxCocoa.podspec

@@ -25,5 +25,5 @@ Pod::Spec.new do |s|
   s.dependency 'RxSwift', '~> 5'
   s.dependency 'RxRelay', '~> 5'
 
-  s.swift_version = '5.0'
+  s.swift_version = '5.1'
 end

RxRelay.podspec

@@ -24,5 +24,5 @@ Relays for RxSwift - PublishRelay and BehaviorRelay
   s.source_files          = 'RxRelay/**/*.{swift,h,m}'
 
   s.dependency 'RxSwift', '~> 5'
-  s.swift_version = '5.0'
+  s.swift_version = '5.1'
 end

RxSwift.podspec

@@ -35,5 +35,5 @@ gitDiff().grep("bug").less          // sequences of swift objects
   s.source_files          = 'RxSwift/**/*.swift', 'Platform/**/*.swift'
   s.exclude_files         = 'RxSwift/Platform/**/*.swift'
 
-  s.swift_version = '5.0'
+  s.swift_version = '5.1'
 end