Update travis CI.

.travis.yml

@@ -9,17 +9,24 @@ matrix:
     - os: osx
       osx_image: xcode10
       env: SWIFT_VERSION=4.2
+    - os: osx
+      osx_image: xcode10.2
+      env: SWIFT_VERSION=5.0
     - os: linux
       env: SWIFT_VERSION=4.0.3
     - os: linux
       env: SWIFT_VERSION=4.1
     - os: linux
       env: SWIFT_VERSION=4.2
+    - os: linux
+      env: SWIFT_VERSION=4.2.3
+    - os: linux
+      env: SWIFT_VERSION=5.0-DEVELOPMENT-SNAPSHOT-2019-03-10-a
 language: generic
 sudo: required
 dist: trusty
 install:
-  - eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"
+  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"; fi
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then wget --output-document /tmp/SwiftLint.pkg https://github.com/realm/SwiftLint/releases/download/0.27.0/SwiftLint.pkg &&
     sudo installer -pkg /tmp/SwiftLint.pkg -target /; fi
 script: