fix: Updating to swift 4

.swift-version

@@ -1 +1 @@
-3.1
+4.0.3

.travis.yml

@@ -20,17 +20,12 @@ matrix:
     - os: linux
       dist: trusty
       sudo: required
-    - os: linux
-      dist: trusty
-      sudo: required
-      env: SWIFT_SNAPSHOT=$SWIFT_4_DEV_SNAPSHOT
     - os: osx
-      osx_image: xcode8.3
+      osx_image: xcode9.2
       sudo: required
-    - os: osx
-      osx_image: xcode9
-      sudo: required
-      env: SWIFT_SNAPSHOT=$SWIFT_4_DEV_SNAPSHOT
+
+before_install:
+  - git clone https://github.com/IBM-Swift/Package-Builder.git
 
 script:
-  - ./build.sh
+  - ./Package-Builder/build-package.sh -projectDir $TRAVIS_BUILD_DIR

README.md

@@ -16,7 +16,7 @@ To use Swift-Kuery-SQLite you must install SQLite.
 
 ### macOS
 
-You can install SQLite with Homebrew:
+You can install SQLite with [Homebrew](https://brew.sh/):
 
 ```
 $ brew install sqlite

Tests/LinuxMain.swift

@@ -25,12 +25,12 @@ extension MutableCollection where Indices.Iterator.Element == Index {
     mutating func shuffle() {
         let c = count
         guard c > 1 else { return }
-        
+
         for (firstUnshuffled, unshuffledCount) in zip(indices, stride(from: c, to: 1, by: -1)) {
             let d: IndexDistance = numericCast(random() % numericCast(unshuffledCount))
             guard d != 0 else { continue }
             let i = index(firstUnshuffled, offsetBy: d)
-            swap(&self[firstUnshuffled], &self[i])
+            self.swapAt(firstUnshuffled, i)
         }
     }
 }