Add support for minimumChangeCount in templates

Backfill release notes with commits up to the given threshold
Prevents releases that list only a single merge or fix, even if larger changes may have been commited as well

src/templates/Compact.js

@@ -9,6 +9,7 @@ export default class Compact extends Default {
   fixesTitle = null
   commitsTitle = null
 
+  minimumChangeCount = 3
   listSpacing = '\n'
 
   renderReleaseHeading = (release, previousRelease) => {

src/templates/Default.js

@@ -11,6 +11,7 @@ export default class Default {
 
   commitListLimit = 3
   commitHashLength = 7
+  minimumChangeCount = 1 // Minimum number of merges/fixes/commits to show per release
 
   sectionSpacing = '\n\n\n'
   listSpacing = '\n\n'
@@ -32,8 +33,9 @@ export default class Default {
     const merges = this.renderMerges(release.merges)
     const fixes = this.renderFixes(release.fixes)
     log = log.concat(merges).concat(fixes)
-    if (merges.length + fixes.length === 0) {
-      log = log.concat(this.renderCommits(release.commits))
+    const backfillCount = this.minimumChangeCount - (release.merges.length + release.fixes.length)
+    if (backfillCount > 0) {
+      log = log.concat(this.renderCommits(release.commits, backfillCount))
     }
     return log.join(this.listSpacing)
   }
@@ -94,11 +96,12 @@ export default class Default {
     return `[\`${number}\`](${href})`
   }
 
-  renderCommits = (commits) => {
+  renderCommits = (commits, limit) => {
     if (commits.length === 0) return []
+    limit = Math.min(limit, this.commitListLimit)
     const list = commits
       .sort(this.sortCommits)
-      .slice(0, this.commitListLimit)
+      .slice(0, limit)
       .map(commit => this.renderCommit({
         subject: commit.subject,
         link: this.renderCommitLink(commit)

test/data/changelog-compact.js

@@ -27,4 +27,5 @@ Generated by [auto-changelog](https://github.com/CookPete/auto-changelog)
 
 * Pull request title [\`#3\`](https://github.com/user/repo/pull/3)
 * Second commit [\`#1\`](https://github.com/user/repo/issues/1), [\`#2\`](https://github.com/user/repo/issues/2)
+* First commit [\`158fdde\`](https://github.com/user/repo/commit/158fdde54b6188c9f9ca3034e9cb5bcc3fe3ff69)
 `