feat: replace the changelog if releaseCount = 0

Author: Luca Huettner

lib/lifecycles/changelog.js

@@ -23,7 +23,7 @@ function outputChangelog (args, newVersion) {
     createIfMissing(args)
     const header = args.header
 
-    let oldContent = args.dryRun ? '' : fs.readFileSync(args.infile, 'utf-8')
+    let oldContent = args.dryRun || args.releaseCount === 0 ? '' : fs.readFileSync(args.infile, 'utf-8')
     const oldContentStart = oldContent.search(START_OF_LAST_RELEASE_PATTERN)
     // find the position of the last release and remove header:
     if (oldContentStart !== -1) {