Switch from Travis to GitHub Actions (#8)

Speeds up builds from 37 min to 15 min

.github/workflows/ci.yaml

@@ -0,0 +1,43 @@
+on: [push, pull_request]
+name: CI
+jobs:
+  lint:
+    name: Lint
+    runs-on: macOS-latest
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_11.1.app
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+
+      # make sure all code has been formatted with rustfmt
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check --color always
+
+      # run clippy to verify we have no warnings
+      - run: rustup component add clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --all-features -- -D warnings
+
+  test:
+    name: Test
+    runs-on: macOS-latest
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_11.1.app
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test

.travis.yml

@@ -1,30 +0,0 @@
-language: rust
-
-rust:
-- stable
-matrix:
-  fast_finish: true
-  include:
-  - os: osx
-    osx_image: xcode10.2
-
-before_script:
-- rustup component add rustfmt clippy
-
-env:
-  global:
-  - RUST_BACKTRACE=1
-
-script:
-# Ensure everything has been rustfmt'ed
-- cargo fmt -- --check
-# Download in a separate step to separate
-# building from fetching dependencies
-- cargo fetch
-# Build everything in a separate step to make a
-# clear distinction between building and testing
-- cargo test --no-run -vv
-- cargo test --no-fail-fast -vv
-# Because rust isn't brutal enough itself
-# We need to run it after the build, otherwise clippy will try to build MoltenVK and travis will time out
-- cargo clippy -- -D warnings