prepare repository for versionist/VersionBot

Connects to #3

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file
+automatically by Versionist. DO NOT EDIT THIS FILE MANUALLY!
+This project adheres to [Semantic Versioning](http://semver.org/).
+

versionist.conf.js

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+var execSync = require('child_process').execSync;
+
+var getAuthor = (commitHash) => {
+  return execSync(`git show --quiet --format="%an" ${commitHash}`, { encoding: 'utf8' }).replace('\n', '');
+}
+
+module.exports = {
+  // This setup allows the editing and parsing of footer tags to get version and type information,
+  // as well as ensuring tags of the type 'v<major>.<minor>.<patch>' are used.
+  // It increments in a semver compatible fashion and allows the updating of NPM package info.
+  editChangelog: true,
+  parseFooterTags: true,
+  getGitReferenceFromVersion: 'v-prefix',
+  incrementVersion: 'semver',
+  updateVersion: (cwd, version, cb) => { cb(); },
+
+  // Always add the entry to the top of the Changelog, below the header.
+  addEntryToChangelog: {
+    preset: 'prepend',
+    fromLine: 6
+  },
+
+  // Only include a commit when there is a footer tag of 'change-type'.
+  // Ensures commits which do not up versions are not included.
+  includeCommitWhen: (commit) => {
+    return !!commit.footer['change-type'];
+  },
+
+  // Determine the type from 'change-type:' tag.
+  // Should no explicit change type be made, then no changes are assumed.
+  getIncrementLevelFromCommit: (commit) => {
+    if (commit.footer['change-type']) {
+      return commit.footer['change-type'].trim();
+    }
+  },
+
+  // If a 'changelog-entry' tag is found, use this as the subject rather than the
+  // first line of the commit.
+  transformTemplateData: (data) => {
+    data.commits.forEach((commit) => {
+      commit.subject = commit.footer['changelog-entry'] || commit.subject;
+      commit.author = getAuthor(commit.hash);
+    });
+
+    return data;
+  },
+
+  template: [
+    '## v{{version}} - {{moment date "Y-MM-DD"}}',
+    '',
+    '{{#each commits}}',
+    '{{#if this.author}}',
+    '* {{capitalize this.subject}} [{{this.author}}]',
+    '{{else}}',
+    '* {{capitalize this.subject}}',
+    '{{/if}}',
+    '{{/each}}'
+  ].join('\n')
+};