Drop windows from Travis (no secret support), add fakeroot for linux

Author: pimterry

.travis.yml

@@ -1,11 +1,26 @@
 language: node_js
 node_js: '10'
+
+cache:
+  directories:
+  - node_modules
+  - $HOME/.cache/electron
+
 os:
 - linux
 - osx
-- windows
+
+osx_image: xcode8.3
+
+addons:
+  apt:
+    packages:
+    - fakeroot
+    - rpm
+
 script:
 - npm run make
+
 deploy:
 - provider: 'script'
   script: npm run publish