build: upgrade setuptools on CI

.travis.yml

@@ -10,7 +10,7 @@ matrix:
             - g++-4.9
           sources: &sources
             - llvm-toolchain-precise-3.8
-            - ubuntu-toolchain-r-test    
+            - ubuntu-toolchain-r-test
     - os: linux
       env: COMPILER_NAME=clang CXX=clang++-3.8 CC=clang-3.8 COMMON_OS_NAME=${TRAVIS_OS_NAME}
       addons:
@@ -24,12 +24,19 @@ matrix:
     - os: osx
       osx_image: xcode11.3
       env: CC=clang && CXX=clang++ COMMON_OS_NAME=darwin
+    - os: windows
+      env: CMAKE_PATH="/c/Program Files/CMake/bin" COMMON_OS_NAME=${TRAVIS_OS_NAME}
+      before_script:
+        - export PATH=$CMAKE_PATH:$PATH
 
 before_install:
   - echo $LANG
   - echo $LC_ALL
   - $CXX --version
 
+install:
+  - pip install --upgrade setuptools
+
 script:
   #    - rvm get head  # Workaround 'shell_session_update: command not found'
   - set -e
@@ -50,7 +57,7 @@ deploy:
   on:
     tags: true
     # no point deploying the images built with both compilers
-    condition: $CC =~ gcc
+    condition: $CC =~ gcc || $COMMON_OS_NAME == "windows"
 
 branches:
   only: