Use Travis CI instead of Circle CI

.travis.yml

@@ -0,0 +1,23 @@
+{
+  "language": "node_js",
+  "node_js": [
+    "node"
+  ],
+  "after_success": [
+    'npm install --global slackup',
+    'npm run pack',
+    './scripts/slack.js'
+  ],
+  "deploy": [
+    "provider": "releases",
+    "on": {
+      "tags": true
+    },
+    "api_key": {
+      "secure": "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"
+    },
+    "file_glob": true,
+    "file": "packed/*",
+    "skip_cleanup": true
+  ]
+}

circle.yml

@@ -1,29 +0,0 @@
-machine:
-  node:
-    version: node
-
-compile:
-  override:
-    - npm run pack
-  post:
-    - cp packed/* $CIRCLE_ARTIFACTS
-
-deployment:
-  default:
-    branch: /.*/
-    owner: zeit
-    commands:
-      - node ./scripts/slack.js
-  release:
-    tag: /.*/
-    owner: zeit
-    commands:
-      - ghr -t $GITHUB_TOKEN -u $CIRCLE_PROJECT_USERNAME -r $CIRCLE_PROJECT_REPONAME -replace $CIRCLE_TAG packed
-      - npm publish --tag beta
-
-dependencies:
-  pre:
-    - echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" >> ~/.npmrc
-  post:
-    - go get github.com/tcnksm/ghr
-    - npm install -g slackup