build: change behavior for auto release type

Author: Planeshifter

lib/node_modules/@stdlib/_tools/changelog/generate/lib/main.js

@@ -266,6 +266,9 @@ function generate( pkg, releaseType ) {
 		pkg = replace( pkg, '@stdlib/', '' );
 		releases = objectEntries( npmReleases( standalone ) );
 	}
+	if ( releases.length > 0 ) {
+		newestRelease = releases[ releases.length-1 ][ 0 ];
+	}
 
 	str = '# CHANGELOG\n\n';
 	str += '> Package changelog.\n\n';
@@ -288,10 +291,20 @@ function generate( pkg, releaseType ) {
 
 	if ( releaseType === 'auto' ) {
 		releaseType = recommendVersionBump( commits.unreleased );
+
+		// If no bump is recommended, default to 'patch' as we still want to trigger a release:
+		if ( releaseType === null ) {
+			releaseType = 'patch';
+		}
+
+		// Ensure major bump only happens if we are already on a major release line:
+		if ( releaseType === 'major' && semver.major( newestRelease ) < 1 ) {
+			releaseType = 'minor';
+		}
+		nextVersion = semver.inc( newestRelease, releaseType );
 	}
 	if ( releaseType && releaseType !== 'none' ) {
-		if ( releases.length > 0 ) {
-			newestRelease = releases[ releases.length-1 ][ 0 ];
+		if ( newestRelease ) {
 			nextVersion = semver.inc( newestRelease, releaseType );
 		} else {
 			nextVersion = semver.inc( '0.0.0', releaseType );