Changed Xcode back to 10.2 for CI config and documentation (apparently withUnsafeBytes doesn't use UnsafeRawBufferPointer prior to 10.2)

Author: sburlewapg

.travis.yml

@@ -1,7 +1,7 @@
 language: objective-c
 rvm: 2.3
 # https://docs.travis-ci.com/user/reference/osx
-osx_image: xcode10.1
+osx_image: xcode10.2
 env:
   global:
     - IOS_SIMULATOR="iPhone 6s"

Documentation/Index.md

@@ -68,7 +68,7 @@
 ## Installation
 
 > _Note:_ SQLite.swift requires Swift 4.2 (and
-> [Xcode 10](https://developer.apple.com/xcode/downloads/)) or greater.
+> [Xcode 10.2](https://developer.apple.com/xcode/downloads/)) or greater.
 
 
 ### Carthage

README.md

@@ -112,7 +112,7 @@ and the [companion repository][SQLiteDataAccessLayer2].
 
 ## Installation
 
-> _Note:_ SQLite.swift requires Swift 4.2 (and [Xcode][] 10).
+> _Note:_ SQLite.swift requires Swift 4.2 (and [Xcode][] 10.2).
 
 ### Carthage