Use GHA instead of Travis where possible

.travis.yml

@@ -1,90 +1,16 @@
-# only run for: merge commits, releases and pull-requests
-if: type != push OR branch = master OR branch =~ /^deploy-\d+\.\d+\.\d+(-.*)?$/ OR branch =~ /^\d+\.\d+\.\d+(-.*)?$/
+# Travis does CD, GHA does CI
+if: branch =~ /^deploy-\d+\.\d+\.\d+(-.*)?$/ OR branch =~ /^\d+\.\d+\.\d+(-.*)?$/
 
 stages:
-  - name: pretest
-    if: NOT branch =~ /^deploy-\d+\.\d+\.\d+(-.*)?$/
-  - name: test
-    if: NOT branch =~ /^deploy-\d+\.\d+\.\d+(-.*)?$/
   - name: deploy
     if: branch =~ /^deploy-\d+\.\d+\.\d+(-.*)?$/
   - name: publish
     if: branch =~ /^\d+\.\d+\.\d+(-.*)?$/
 
 os: osx
-language: swift
-osx_image: xcode10.1
-xcode_project: Path.swift.xcodeproj
-xcode_scheme: Path.swift-Package
 
 jobs:
   include:
-    - name: macOS / Swift 4.0.3
-      before_script: swift build -Xswiftc -warnings-as-errors
-      script: swift test --parallel -Xswiftc -swift-version -Xswiftc 4
-
-    - &std
-      name: macOS / Swift 4.2.1
-      before_script: swift build -Xswiftc -warnings-as-errors
-      script: swift test --parallel
-
-    - <<: *std
-      name: macOS / Swift 5.0
-      osx_image: xcode10.2
-
-    - <<: *std
-      name: macOS / Swift 5.1
-      osx_image: xcode11
-
-    - &xcodebuild
-      before_install: swift package generate-xcodeproj --enable-code-coverage
-      xcode_destination: platform=iOS Simulator,OS=latest,name=iPhone XS
-      name: iOS / Swift 4.2.1
-      after_success: bash <(curl -s https://codecov.io/bash)
-
-    - <<: *xcodebuild
-      xcode_destination: platform=tvOS Simulator,OS=latest,name=Apple TV
-      name: tvOS / Swift 4.2.1
-
-    - <<: *xcodebuild
-      name: watchOS / Swift 4.2.1
-      script: |
-        set -o pipefail
-        xcodebuild \
-          -project Path.swift.xcodeproj \
-          -scheme Path.swift-Package \
-          -destination 'platform=watchOS Simulator,OS=latest,name=Apple Watch Series 4 - 40mm' \
-          build | xcpretty
-      after_success: false
-
-    - &linux
-      env: SWIFT_VERSION=4.2.4
-      os: linux
-      name: Linux / Swift 4.2.4
-      language: generic
-      sudo: false
-      install: eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"
-      before_script: swift build -Xswiftc -warnings-as-errors
-      script: swift test --parallel
-
-    - <<: *linux
-      env: SWIFT_VERSION=5.0.3
-      name: Linux / Swift 5.0.3
-
-    - <<: *linux
-      env: SWIFT_VERSION=5.1.3
-      name: Linux / Swift 5.1.3
-      
-    - <<: *linux
-      env: SWIFT_VERSION=5.2-DEVELOPMENT-SNAPSHOT-2020-01-22-a
-      name: Linux / Swift 5.2.0-dev+2020-01-22-a
-
-    - stage: pretest
-      name: Check Linux tests are sync’d
-      install: swift test --generate-linuxmain
-      script: git diff --exit-code
-      osx_image: xcode10.2
-
     - stage: deploy
       name: Deploy
       osx_image: xcode11
@@ -105,7 +31,7 @@ jobs:
 
     - stage: publish
       name: Jazzy
-      osx_image: xcode10.2
+      osx_image: xcode11
       install: gem install jazzy
       before_script: swift package generate-xcodeproj
       script: |
@@ -121,8 +47,8 @@ jobs:
           tags: true
 
     - name: CocoaPods
-      osx_image: xcode10.2
       env: HOMEBREW_NO_INSTALL_CLEANUP=1
+      osx_image: xcode11
       install:
         - brew install mxcl/made/swift-sh
         - curl -O https://raw.githubusercontent.com/mxcl/ops/master/deploy