Updates to CI config

Use jobs/stages; enable email notifications; don't require sudo linux images.

Author: tsolomko

.travis.yml

@@ -1,29 +1,44 @@
-env:
-  global:
-    secure: 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
-matrix:
-    include:
-    - language: objective-c
+jobs:
+  include:
+    - stage: test
+      language: objective-c
       osx_image: xcode9.2
-      before_deploy:
+      script:
+      - swift build
+      - swift test
+      - swift build -c release # Check Release build just in case.
+    - language: generic
+      os: linux
+      dist: trusty
+      install:
+      - eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)"
+      script:
+      - swift build
+      - swift test
+      - swift build -c release # Check Release build just in case.
+    - stage: deploy
+      if: env(TRAVIS_TAG) IS present
+      language: objective-c
+      osx_image: xcode9.2
+      env:
+        secure: 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
+      before_install:
       - brew update
+      install:
       # Update Carthage.
       # `brew outdated` is necessary to prevent build error when there is no updates for Carthage.
       - brew outdated carthage || brew upgrade carthage
       # Install SourceKitten and Jazzy.
       - brew install sourcekitten
       - gem install jazzy
-      # Generate documentation.
-      - sourcekitten doc --spm-module BitByteData > docs.json
-      - jazzy 
-      # Build Carthage archive.
+      before_deploy:
       - swift package generate-xcodeproj
+      # Build Carthage archive.
       - carthage build --no-skip-current
       - carthage archive BitByteData
-      script:
-      - swift build
-      - swift test
-      - swift build -c release # Check Release build just in case.
+      # Generate documentation.
+      - sourcekitten doc --spm-module BitByteData > docs.json
+      - jazzy
       deploy:
       - provider: releases
         skip_cleanup: true
@@ -39,15 +54,3 @@ matrix:
           tags: true
           # Don't upload documentation if it is a test release.
           condition: $(git describe) != *"test"*
-    - language: generic
-      os: linux
-      sudo: required
-      dist: trusty
-      install:
-      - eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)"
-      script:
-      - swift build
-      - swift test
-      - swift build -c release # Check Release build just in case.
-notifications:
-  email: false