ci(release): enable semantic release on next branch

.travis.yml

@@ -7,6 +7,7 @@ branches:
   only:
     - master
     - v6
+    - next
     - /^greenkeeper/.*$/
   except:
     - /^v\d+\.\d+\.\d+$/
@@ -84,6 +85,6 @@ stages:
   - lint
   - test
   - name: release
-    if: (branch = master OR branch = beta) AND type = push AND fork = false
+    if: (branch = master OR branch = next) AND type = push AND fork = false
   - name: docs
     if: branch = master AND type = push AND fork = false