Linkify the PR in the change log. (#8790)

aaltay · tseaver · commit f69ad9aed2c5 · 2019-07-26T08:19:09.000-04:00
diff --git a/packages/google-cloud-core/CHANGELOG.md b/packages/google-cloud-core/CHANGELOG.md
@@ -9,7 +9,7 @@
 06/11/2019 15:19 PDT
 
 ### Internal Changes 
-- Prevent requests from hanging on SSL handshake issue by adding a max timeout of 5 minutes. (#8207)
+- Prevent requests from hanging on SSL handshake issue by adding a max timeout of 5 minutes. ([#8207](https://github.com/googleapis/google-cloud-python/pull/8207))
 
 ## 1.0.1
 
