Use travis's own releases integrate to publish

The built-in electron forge publish command fails, as it looks
for the wrong file name for some reason. Windows works fine
though, so leaving appveyor as-is.

Author: pimterry

.travis.yml

@@ -22,8 +22,11 @@ script:
 - npm run make
 
 deploy:
-- provider: 'script'
-  script: npm run publish
+- provider: releases
+  api_key: $GITHUB_TOKEN
+  file_glob: true
+  file: out/make/*.{zip,deb,dmg}
   skip_cleanup: true
   on:
+    repo: httptoolkit/httptoolkit-desktop
     tags: true