refactor: add release notes in one place

lib/workers/pr/changelog/index.js

 const versioning = require('../../../versioning');
-const { addReleaseNotes } = require('./release-notes');
 
 const sourceGithub = require('./source-github');
 
@@ -42,15 +41,14 @@ async function getChangeLogJSON(args) {
 
   try {
     const res = await sourceGithub.getChangeLogJSON({ ...args });
-    const output = await addReleaseNotes(res);
     const cacheMinutes = 60;
     await renovateCache.set(
       cacheNamespace,
       getCacheKey(args),
-      output,
+      res,
       cacheMinutes
     );
-    return output;
+    return res;
   } catch (err) /* istanbul ignore next */ {
     logger.error(
       { err, message: err.message, stack: err.stack },

lib/workers/pr/changelog/source-github.js

@@ -2,6 +2,7 @@ const URL = require('url');
 const endpoints = require('../../../util/endpoints');
 const versioning = require('../../../versioning');
 const ghGot = require('../../../platform/github/gh-got-wrapper');
+const { addReleaseNotes } = require('./release-notes');
 
 module.exports = {
   getChangeLogJSON,
@@ -131,7 +132,7 @@ async function getChangeLogJSON({
     }
   }
 
-  const res = {
+  let res = {
     project: {
       githubBaseURL,
       github: repository,
@@ -140,6 +141,7 @@ async function getChangeLogJSON({
     versions: changelogReleases,
   };
 
-  logger.debug({ res }, 'Manual res');
+  res = await addReleaseNotes(res);
+
   return res;
 }

test/workers/pr/changelog.spec.js → test/workers/pr/changelog/index.spec.js

-jest.mock('../../../lib/platform/github/gh-got-wrapper');
-jest.mock('../../../lib/datasource/npm');
+jest.mock('../../../../lib/platform/github/gh-got-wrapper');
+jest.mock('../../../../lib/datasource/npm');
 jest.mock('got');
 
-const endpoints = require('../../../lib/util/endpoints');
-const ghGot = require('../../../lib/platform/github/gh-got-wrapper');
+const endpoints = require('../../../../lib/util/endpoints');
+const ghGot = require('../../../../lib/platform/github/gh-got-wrapper');
 
-const { getChangeLogJSON } = require('../../../lib/workers/pr/changelog');
+const { getChangeLogJSON } = require('../../../../lib/workers/pr/changelog');
+const releaseNotes = require('../../../../lib/workers/pr/changelog/release-notes');
+
+releaseNotes.addReleaseNotes = jest.fn(input => input);
 
 const upgrade = {
   depName: 'renovate',

test/workers/pr/release-notes.spec.js → test/workers/pr/changelog/release-notes.spec.js

 const fs = require('fs-extra');
 const ghGot = require('gh-got');
 const {
+  addReleaseNotes,
   getReleaseNotes,
   getReleaseNotesMd,
-} = require('../../../lib/workers/pr/changelog/release-notes');
+} = require('../../../../lib/workers/pr/changelog/release-notes');
 
 const angularJsChangelogMd = fs.readFileSync(
   'test/_fixtures/changelog-md/angular.js.md',
@@ -28,6 +29,12 @@ const contentsResponse = [
 jest.mock('gh-got');
 
 describe('workers/pr/release-notes', () => {
+  describe('addReleaseNotes()', () => {
+    it('returns input if invalid', async () => {
+      const input = { a: 1 };
+      expect(await addReleaseNotes(input)).toEqual(input);
+    });
+  });
   describe('getReleaseNotes()', () => {
     it('gets release notes', async () => {
       ghGot.mockReturnValueOnce({