fix: allow multiple branches with same channel

lib/get-last-release.js

@@ -1,6 +1,6 @@
 const {isUndefined} = require('lodash');
 const semver = require('semver');
-const {makeTag} = require('./utils');
+const {makeTag, isSameChannel} = require('./utils');
 
 /**
  * Last release.
@@ -28,7 +28,10 @@ const {makeTag} = require('./utils');
  */
 module.exports = ({branch, options: {tagFormat}}, {before} = {}) => {
   const [{version, gitTag, channel} = {}] = branch.tags
-    .filter(tag => (branch.type === 'prerelease' && branch.channel === tag.channel) || !semver.prerelease(tag.version))
+    .filter(
+      tag =>
+        (branch.type === 'prerelease' && isSameChannel(branch.channel, tag.channel)) || !semver.prerelease(tag.version)
+    )
     .filter(tag => isUndefined(before) || semver.lt(tag.version, before))
     .sort((a, b) => semver.rcompare(a.version, b.version));