Fix Windows actions. (#41)

* Invoke CTest directly.

* Remove VS2017 build for now.

* Fix docs.

.github/workflows/windows.yml

@@ -13,32 +13,6 @@ env:
 
 jobs:
 
-  VS2017:
-    runs-on: windows-2016
-
-    strategy:
-      matrix:
-        config: [Debug, Release]
-
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Configure
-      run: |
-        cmake -Bbuild -DCMAKE_BUILD_TYPE=${{matrix.config}} .
-
-    - name: Build tests
-      run: >
-        cmake --build build --config ${{matrix.config}}
-        --target unit_test_runner -j4
-
-        cmake --build build --config ${{matrix.config}}
-        --target single_header_tester
-
-    - name: Test
-      run: |
-        cmake --build build --config ${{matrix.config}} --target ctest
-
   VS2019:
     runs-on: windows-2019
 
@@ -63,4 +37,5 @@ jobs:
 
     - name: Test
       run: |
-        cmake --build build --config ${{matrix.config}} --target ctest
+        cd build
+        ctest --build-config ${{matrix.config}}

docs/getting-started.md

@@ -5,15 +5,12 @@ The Core Library
 ----------------
 
 The core of alia should work on any C++14 compiler. It has no external
-dependencies. It's regularly tested on:
+dependencies. The following compilers are officially supported:
 
-- Visual C++ 2015 and 2017 (x86 and x64 for both, C++14 features only)
-- GCC 5 (C++14 only) and 7 (with C++17 features)
-- Clang 4.0 (C++14 only) and 5.0 (with C++17 features)
-- Emscripten 1.39.7 (including C++17 features)
-
-It should support more recent versions of the above. If you find otherwise,
-please open an issue.
+- Visual C++ 2015 and higher
+- GCC 5 and higher
+- Clang 4.0 and higher
+- Emscripten 1.39.7 and higher
 
 ### Getting It