fix: use changelog to determine new version

lib/prepare_release.js

@@ -178,14 +178,11 @@ class ReleasePreparation {
       patch: semver.patch(lastTagVersion)
     };
 
-    const raw = this.getBranchDiff({
-      onlyNotableChanges: false,
-      comparisonBranch: `v${lastTagVersion}`
-    });
+    const changelog = this.getChangelog();
 
-    if (raw.includes('SEMVER-MAJOR')) {
+    if (changelog.includes('SEMVER-MAJOR')) {
       newVersion = `${lastTag.major + 1}.0.0`;
-    } else if (raw.includes('SEMVER-MINOR')) {
+    } else if (changelog.includes('SEMVER-MINOR')) {
       newVersion = `${lastTag.major}.${lastTag.minor + 1}.0`;
     } else {
       newVersion = `${lastTag.major}.${lastTag.minor}.${lastTag.patch + 1}`;
@@ -431,11 +428,11 @@ class ReleasePreparation {
       branchDiffOptions = [
         `${upstream}/${releaseBranch}`,
         proposalBranch,
-        `--require-label=${notableLabels.join(',')}`,
+        `--require-label=${notableLabels.join(',')}`
       ];
 
       if (opts.simple) {
-        branchDiffOptions.push('--simple')
+        branchDiffOptions.push('--simple');
       }
     } else {
       const excludeLabels = [
@@ -451,15 +448,10 @@ class ReleasePreparation {
         excludeLabels.push('semver-minor');
       }
 
-      let comparisonBranch = 'master';
-      if (opts.comparisonBranch) {
-        comparisonBranch = opts.comparisonBranch;
-      }
-
       branchDiffOptions = [
         stagingBranch,
         // TODO(codebytere): use Current branch instead of master for LTS
-        comparisonBranch,
+        'master',
         `--exclude-label=${excludeLabels.join(',')}`,
         '--filter-release'
       ];