Pivot windows CI to github actions

Currently windows CI is configured to run in appveyor however appveyor
is not configured to run on rust-numpy in the PyO3 github organization
so there has been no CI running on windows. This commit fixes this by
switching the windows CI to run in github actions instead of using
appveyor. This makes it consistent with how windows testing is run with
PyO3/PyO3.

Fixes #128

Author: mtreinish

.github/workflows/test.yml

@@ -0,0 +1,43 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }}
+    runs-on: ${{ matrix.platform.os }}
+    strategy:
+      max-parallel: 12
+      matrix:
+        python-version: [3.5, 3.6, 3.7, 3.8]
+        platform: [
+          { os: "macOS-latest",   python-architecture: "x64", rust-target: "x86_64-apple-darwin" },
+          { os: "windows-latest", python-architecture: "x64", rust-target: "x86_64-pc-windows-msvc" },
+          { os: "windows-latest", python-architecture: "x86", rust-target: "i686-pc-windows-msvc" },
+        ]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          default: true
+      - run: rustup set default-host ${{ matrix.platform.rust-target }}
+      - name: Build without default features
+        run: cargo build --no-default-features --verbose
+      - name: Build with default features
+        run: cargo build --verbose
+      - name: Install test dependencies
+        run: |
+          python -m pip install -U pip setuptools
+          pip install setuptools-rust pytest pytest-benchmark tox tox-venv
+      - name: Test
+        run: ci/actions/test.sh
+        shell: bash
+    env:
+      RUST_BACKTRACE: 1

appveyor.yml

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -ex
+
+cargo build --verbose --features $FEATURES
+cargo test --verbose --features $FEATURES -- --test-threads=1
+
+for example_dir in examples/*; do
+    cd $example_dir
+    tox -c "tox.ini" -e py
+    cd -
+done