support multiOS CI builds

.github/workflows/conan.yaml

 name: build conan package
-on: push
+on: [push, pull_request]
 jobs:
   build_conan:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ windows-latest, ubuntu-latest, macos-latest ]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+          architecture: 'x64'
       # install dependencies
-      - name: dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -yq python3 python3-pip python3-setuptools build-essential cmake make
-          sudo pip3 install conan
-      # build project
-      - name: build conan package
+      - name: install conan
+        run: pip3 install conan
+      - name: setup conan
         run: |
           conan profile new default --detect --force # Generates default profile detecting GCC and sets old ABI
+      # new ABI version needs to be set on GCC >= 5
+      - name: set ABI
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: |
           conan profile update settings.compiler.libcxx=libstdc++11 default  # Sets libcxx to C++11 ABI
+      - name: build conan package
+        run: |
           conan create .
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