Add tests on Linux with Swift 5.0.

.travis.yml

@@ -1,11 +1,10 @@
 language: objective-c
 
 os:
- - linux
  - osx
 language: generic
 sudo: required
-dist: trusty
+dist: xenial
 osx_image: xcode9.3
 
 env:
@@ -21,19 +20,15 @@ matrix:
  - os: osx
  env: DANGER=1
 
- - os: linux
- env: TEST=iOS
-
- - os: linux
- env: TEST=watchOS
-
- - os: linux
- env: TEST=tvOS
-
- - os: linux
- env: TEST=iOS-Example
-
  include:
+ - osx_image:
+ os: linux
+ env: TEST=Unix swift=5.0
+
+ - osx_image:
+ os: linux
+ env: TEST=Unix swift=4.0
+
  - osx_image: xcode9.4
  os: osx
  env: TEST=iOS
@@ -80,14 +75,14 @@ notifications:
  email: false
 
 install:
- - if [ `uname` == "Linux" ] ; then
- eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)";
+ - if [[ `uname` == "Linux" ]] ; then
+ curl "https://swift.org/builds/swift-${swift}-release/ubuntu1604/swift-${swift}-RELEASE/swift-${swift}-RELEASE-ubuntu16.04.tar.gz" > /tmp/swift.tar.gz;
+ tar -xzf /tmp/swift.tar.gz -C /tmp;
+ export PATH="${PATH}:/tmp/swift-${swift}-RELEASE-ubuntu16.04/usr/bin";
+ swift -version;
  fi
 
 script:
- - if [[ `uname` == "Linux" ]] ; then
- swiftenv install swift-4.2 || true;
- fi
  - if [[ `uname` == "Unix" ]] ; then
  brew install swiftlint || true;
  fi