fix: replace travis-deploy-once with travis-ci stage (#133)

Fixes #132

.travis.yml

@@ -18,6 +18,12 @@ env:
     # See https://git.io/vdao3 for details.
     - JOBS=1
 
+stages:
+  - 'Tests'
+  - 'Additional Tests'
+  - name: 'Deploy'
+    if: branch = master AND type = push
+
 jobs:
   fail_fast: true
   allow_failures:
@@ -47,6 +53,10 @@ jobs:
     - env: EMBER_TRY_SCENARIO=ember-canary
     - env: EMBER_TRY_SCENARIO=ember-default-with-jquery
 
+    - stage: 'Deploy'
+      name: 'Publish to NPM'
+      script: yarn semantic-release
+
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH=$HOME/.yarn/bin:$PATH
@@ -55,4 +65,4 @@ install:
   - yarn install --no-lockfile --non-interactive
 
 script:
-  - node_modules/.bin/ember try:one $EMBER_TRY_SCENARIO && yarn travis-deploy-once "yarn semantic-release"
+  - node_modules/.bin/ember try:one $EMBER_TRY_SCENARIO

package.json

@@ -10,7 +10,6 @@
     "build": "ember build",
     "start": "ember server",
     "test": "ember try:each",
-    "travis-deploy-once": "travis-deploy-once",
     "semantic-release": "semantic-release"
   },
   "repository": "https://github.com/mike-north/ember-add-to-homescreen.git",
@@ -70,8 +69,7 @@
   "dependencies": {
     "add-to-homescreen": "^3.2.6",
     "ember-cli-babel": "^7.1.3",
-    "ember-cli-htmlbars": "^3.0.1",
-    "travis-deploy-once": "^5.0.9"
+    "ember-cli-htmlbars": "^3.0.1"
   },
   "ember-addon": {
     "configPath": "tests/dummy/config"