add apps.json

.travis.yml

+language: node_js
+node_js: node
+
+os:
+  - linux
+  - osx
+
+addons:
+  apt:
+    packages:
+      - icnsutils
+      - graphicsmagick
+      - xz-utils
+
+cache:
+  directories:
+  - node_modules
+  - app/node_modules
+  - $HOME/.electron
+  - $HOME/.cache
+
+install:
+- npm install electron-builder # force install next version to test electron-builder
+- npm install
+- npm prune
+
+script:
+- npm run release
+
+branches:
+  only:
+    - v3
\ No newline at end of file