Add CI & changelog.

closes #12

Author: thedodd

.github/workflows/ci.yaml

@@ -0,0 +1,18 @@
+name: ci
+on: [push]
+
+jobs:
+  build:
+    name: build
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build

CHANGELOG.md

@@ -0,0 +1,15 @@
+changelog
+=========
+
+## Unreleased
+
+## 0.1.2
+### changed
+- Swap our `grass` for `sass-rs`.
+
+## 0.1.1
+### fixed
+- Fix an issue with the watch system which was breaking builds on Windows.
+
+## 0.1.0
+- Initialize release. See the [release notes on Github](https://github.com/thedodd/trunk/releases/tag/v0.1.0) for more info.