feat(semantic-release): set up deployment with semantic release

Install and configure commitlint
Configure semantic release to deploy in an additional stage, if on the develop branch

.travis.yml

@@ -1,9 +1,23 @@
-sudo: false
 language: node_js
 node_js:
-  - "8"
-  - "10"
-  - "node"
+  - 8
+  - 10
+  - node
 cache:
   directories:
   - node_modules
+script:
+  - commitlint-travis
+  - npm test
+jobs:
+  include:
+  - stage: release
+    node_js: 10
+    script: echo deploying...
+    deploy:
+    - provider: script
+      script: npx semantic-release
+stages:
+- test
+- name: release
+  if: branch = develop

commitlint.config.js

@@ -0,0 +1 @@
+module.exports = {extends: ['@commitlint/config-conventional']}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "scratch-analysis",
-  "version": "2.0.0",
+  "version": "0.0.0",
   "description": "Analysis tool for summarizing the structure, composition, and complexity of Scratch programs.",
   "main": "lib/index.js",
   "directories": {
@@ -20,6 +20,9 @@
     "scratch-parser": "5.0.0"
   },
   "devDependencies": {
+    "@commitlint/cli": "13.1.0",
+    "@commitlint/config-conventional": "13.1.0",
+    "@commitlint/travis-cli": "13.1.0",
     "babel-eslint": "^10.0.1",
     "eslint": "^5.10.0",
     "eslint-config-scratch": "^5.0.0",