travis: Install nodejs on Windows

.travis.yml

@@ -50,6 +50,7 @@ before_install:
     # https://travis-ci.community/t/go-cant-find-gcc-with-go1-11-1-on-windows/293/5
   - if [ "$TRAVIS_OS_NAME" = "windows" ]; then
         choco install mingw -y;
+        choco install -y --force nodejs;
         export PATH=/c/tools/mingw64/bin:"$PATH";
     fi
   - gem install asciidoctor