Merge pull request scottrhoyt#17 from scottrhoyt/update_swift_version

Update Swift versions.

.swift-version

@@ -0,0 +1 @@
+3.0.2

.travis.yml

@@ -8,7 +8,7 @@ matrix:
     - script: set -o pipefail && xcodebuild -scheme SwiftyTextTable -project SwiftyTextTable.xcodeproj clean build test | xcpretty
       env: JOB=Xcode
       os: osx
-      osx_image: xcode8
+      osx_image: xcode8.2
       language: objective-c
       before_install:
         - ./scripts/upstall-carthage.sh
@@ -23,31 +23,17 @@ matrix:
         - TOOLCHAINS=swift swift test
       env: JOB=SPM
       os: osx
-      osx_image: xcode8
+      osx_image: xcode8.2
       language: objective-c
-      before_install:
-        - export SWIFT_SNAPSHOT=swift-DEVELOPMENT-SNAPSHOT-2016-09-07-a
-        - curl https://swift.org/builds/development/xcode/$SWIFT_SNAPSHOT/$SWIFT_SNAPSHOT-osx.pkg -o swift.pkg
-        - sudo installer -pkg swift.pkg -target /
     - script:
         - swift build
         - swift test
       env: JOB=Linux
       sudo: required
       dist: trusty
       language: generic
-      before_install:
-        - wget -q -O - https://swift.org/keys/all-keys.asc | gpg --import -
-        - cd ..
-        - gpg --keyserver hkp://pool.sks-keyservers.net --refresh-keys Swift
-        - export SWIFT_SNAPSHOT=swift-DEVELOPMENT-SNAPSHOT-2016-09-07-a
-        - export SWIFT_URL=https://swift.org/builds/development/ubuntu1404/$SWIFT_SNAPSHOT/$SWIFT_SNAPSHOT-ubuntu14.04.tar.gz
-        - wget $SWIFT_URL
-        - wget $SWIFT_URL.sig
-        - gpg --verify $SWIFT_SNAPSHOT-ubuntu14.04.tar.gz.sig
-        - tar xzf $SWIFT_SNAPSHOT-ubuntu14.04.tar.gz
-        - export PATH="${PWD}/${SWIFT_SNAPSHOT}-ubuntu14.04/usr/bin:${PATH}"
-        - cd SwiftyTextTable
+      install:
+        - eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)"
 
   exclude:
     - script: placeholder # workaround for https://github.com/travis-ci/travis-ci/issues/4681