update ruby -- master = upcoming

Author: kay-kim

data/ruby-driver-published-branches.yaml

@@ -1,5 +1,6 @@
 version:
   published:
+    - '2.7'
     - '2.6'
     - '2.5'
     - '2.4'
@@ -8,19 +9,21 @@ version:
     - '2.0'
     - '1.x'
   active:
+    - '2.7'
     - '2.6'
     - '2.5'
     - '2.4'
     - '2.3'
     - '2.2'
     - '2.0'
   stable: '2.6'
-  upcoming: null
+  upcoming: 2.7
 git:
   branches:
     manual: 'master'
     published:
       - 'master'
+      - 'v2.6'
       - 'v2.5'
       - 'v2.4'
       - 'v2.3'