Reverted other instances of swift 5 / Xcode 10.2 in documentation

Author: sburlewapg

Documentation/Index.md

@@ -67,8 +67,8 @@
 
 ## Installation
 
-> _Note:_ SQLite.swift requires Swift 5 (and
-> [Xcode 10.2](https://developer.apple.com/xcode/downloads/)) or greater.
+> _Note:_ SQLite.swift requires Swift 4.2 (and
+> [Xcode 9.3](https://developer.apple.com/xcode/downloads/)) or greater.
 
 
 ### Carthage

README.md

@@ -1,6 +1,6 @@
 # SQLite.swift
 
-[![Build Status][TravisBadge]][TravisLink] [![CocoaPods Version][CocoaPodsVersionBadge]][CocoaPodsVersionLink] [![Swift5 compatible][Swift5Badge]][Swift5Link] [![Platform][PlatformBadge]][PlatformLink] [![Carthage compatible][CartagheBadge]][CarthageLink] [![Join the chat at https://gitter.im/stephencelis/SQLite.swift][GitterBadge]][GitterLink]
+[![Build Status][TravisBadge]][TravisLink] [![CocoaPods Version][CocoaPodsVersionBadge]][CocoaPodsVersionLink] [![Swift4 compatible][Swift4Badge]][Swift4Link] [![Platform][PlatformBadge]][PlatformLink] [![Carthage compatible][CartagheBadge]][CarthageLink] [![Join the chat at https://gitter.im/stephencelis/SQLite.swift][GitterBadge]][GitterLink]
 
 A type-safe, [Swift][]-language layer over [SQLite3][].
 
@@ -112,7 +112,7 @@ and the [companion repository][SQLiteDataAccessLayer2].
 
 ## Installation
 
-> _Note:_ SQLite.swift requires Swift 5 (and [Xcode][] 10.2).
+> _Note:_ SQLite.swift requires Swift 4.2 (and [Xcode][] 9.3).
 
 ### Carthage
 

SQLite.swift.podspec

@@ -21,7 +21,7 @@ Pod::Spec.new do |s|
   s.watchos.deployment_target = "2.2"
   s.default_subspec  = 'standard'
   s.pod_target_xcconfig = {
-    'SWIFT_VERSION' => '5',
+    'SWIFT_VERSION' => '4.2',
   }
 
   s.subspec 'standard' do |ss|