build: add Travis-CL integration

Author: progician

.travis.yml

@@ -0,0 +1,34 @@
+dist: xenial
+sudo: required
+language: cpp
+
+matrix:
+  include:
+    - os: linux
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - gcc-9
+            - g++-9
+      env:
+        - MATRIX_EVAL="CC=gcc-9 && CXX=g++-9"
+
+    - os: osx
+      osx_image: xcode10.1
+      env:
+        - MATRIX_EVAL="PATH=$HOME/Library/Python/2.7/bin:$PATH && CC=clang && CXX=clang++"
+
+before_install:
+    - eval "${MATRIX_EVAL}"
+
+install:
+  - pip install --user -U pip
+  - pip install --user cmake ninja conan pytest
+
+script:
+  - conan install -if build . --build=missing
+  - cmake -GNinja -DCMAKE_BUILD_TYPE=Release -Bbuild .
+  - cmake --build build
+  - cmake --build build --target test