Add automated release setup, and document in RELEASE.md.

Author: rwjblue

RELEASE.md

@@ -0,0 +1,41 @@
+# Release
+
+Releases are mostly automated using
+[release-it](https://github.com/release-it/release-it/) and
+[lerna-changelog](https://github.com/lerna/lerna-changelog/).
+
+
+## Preparation
+
+Since the majority of the actual release process is automated, the primary
+remaining task prior to releasing is confirming that all pull requests that
+have been merged since the last release have been labeled with the appropriate
+`lerna-changelog` labels and the titles have been updated to ensure they
+represent something that would make sense to our users. Some great information
+on why this is important can be found at
+[keepachangelog.com](https://keepachangelog.com/en/1.0.0/), but the overall
+guiding principles here is that changelogs are for humans, not machines.
+
+When reviewing merged PR's the labels to be used are:
+
+* breaking - Used when the PR is considered a breaking change.
+* enhancement - Used when the PR adds a new feature or enhancement.
+* bug - Used when the PR fixes a bug included in a previous release.
+* documentation - Used when the PR adds or updates documentation.
+* internal - Used for internal changes that still require a mention in the
+  changelog/release notes.
+
+
+## Release
+
+Once the prep work is completed, the actual release is straight forward:
+
+```
+yarn install
+yarn release
+```
+
+The `release` script leverages
+[release-it](https://github.com/release-it/release-it/) to do the mechanical
+release process. It will prompt you through the process of choosing the version
+number, tagging, pushing the tag and commits, etc.

package.json

@@ -16,6 +16,7 @@
     "build": "ember build",
     "changelog": "lerna-changelog",
     "lint:js": "eslint .",
+    "release": "release-it",
     "start": "ember serve",
     "test": "ember test",
     "test:all": "ember try:each"
@@ -53,15 +54,31 @@
     "eslint-plugin-node": "^8.0.1",
     "lerna-changelog": "^0.8.2",
     "loader.js": "^4.7.0",
-    "qunit-dom": "^0.8.5"
+    "qunit-dom": "^0.8.5",
+    "release-it": "^12.2.1",
+    "release-it-lerna-changelog": "^1.0.3"
   },
   "engines": {
     "node": "6.* || 8.* || >= 10.*"
   },
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org"
+  },
   "ember-addon": {
     "configPath": "tests/dummy/config"
   },
-  "publishConfig": {
-    "access": "public"
+  "release-it": {
+    "plugins": {
+      "release-it-lerna-changelog": {
+        "infile": "CHANGELOG.md"
+      }
+    },
+    "git": {
+      "tagName": "v${version}"
+    },
+    "github": {
+      "release": true
+    }
   }
 }