Increase OS/node.js matrix for generated binaries (#17)

* Adding back publish:github

* Adding node.js 15 for github assets generation

* Use latest g++

* Exclude linux and node 15

* Format issue

* Reverting g++ version update

.travis.yml

@@ -7,11 +7,17 @@ dist: trusty
 os:
   - linux
   - osx
+  - windows
 node_js:
+  - "15"
   - "14"
   - "12"
   - "10"
   - "8"
+jobs:
+  exclude:
+   - os: linux
+     node_js: "15"
 before_install:
   - echo Building for Node $TRAVIS_NODE_VERSION
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX=$LINUX_CXX; $CXX --version; fi;