chore(changelog): regenerate changelog for beta.16 including refactor

- the script explicitly takes input for the starting tag.
- the script only prepends changes.

scripts/publish/changelog.js

@@ -7,20 +7,33 @@
  * (https://www.npmjs.com/package/conventional-changelog), which also prepends
  * changes to CHANGELOG.md.
  *
- * Runs with default (latest tag...head)
- * $ ./changelog.js
+ * Appends CHANGELOG.md with the changes between tag and HEAD.
+ * NOTE: only `fix`, `feat`, `perf` and `revert` commits are used
+ * see: https://github.com/conventional-changelog/conventional-changelog/blob/v0.2.1/presets/angular.js#L24
  */
 
 var fs = require('fs');
 var cl = require('conventional-changelog');
+const exec = require('child_process').exec;
 
-var changelogStream = fs.createWriteStream('CHANGELOG.md');
+var changelogStream = fs.createWriteStream('CHANGELOG-delta.md');
+
+if (process.argv.length < 3) {
+  console.log('Usage: ./scripts/publish/changelog.js <start-tag>');
+  process.exit(-1);
+}
 
 var config = {
   preset: 'angular',
   releaseCount: 1,
 };
 
-cl(config).on('error', function(err) {
+var prependDelta = function() {
+  exec('cat CHANGELOG-delta.md CHANGELOG.md > CHANGELOG-new.md;' +
+       'mv CHANGELOG-new.md CHANGELOG.md;'
+       'rm CHANGELOG-delta.md');
+}
+
+cl(config, null, {from: process.argv[2]}).on('error', function(err) {
             console.error('Failed to generate changelog: ' + err);
-          }).pipe(changelogStream);
+          }).pipe(changelogStream).on('close', prependDelta);