Bump version number on website/config.yaml. (#1822)

diff --git a/website/config.yaml b/website/config.yaml
index 56ba56d..ac3aa68 100755
--- a/website/config.yaml
+++ b/website/config.yaml
@@ -20,7 +20,7 @@
   author: Twitter, Inc.
   description: A realtime, distributed, fault-tolerant stream processing engine from Twitter
   versions:
-    heron: 0.14.5
+    heron: 0.14.7
     bazel: 0.3.1
   assets:
     favicon: