chore: release pubsub/v1.6.0 (#2627)

* chore: release pubsub/v1.6.0
diff --git a/internal/version/version.go b/internal/version/version.go
index 54d3ee0..10b0e8c 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -26,7 +26,7 @@
 
 // Repo is the current version of the client libraries in this
 // repo. It should be a date in YYYYMMDD format.
-const Repo = "20200721"
+const Repo = "20200722"
 
 // Go returns the Go runtime version. The returned string
 // has no whitespace.
diff --git a/pubsub/CHANGES.md b/pubsub/CHANGES.md
index aab62a4..c130bae 100644
--- a/pubsub/CHANGES.md
+++ b/pubsub/CHANGES.md
@@ -1,5 +1,12 @@
 # Changes
 
+## v1.6.0
+
+- Fix issue where subscriber streams were limited because it was using a single grpc conn.
+	- As a side effect, publisher and subscriber grpc conns are no longer shared.
+- Add fake time function in pstest.
+- Add support for server side flow control.
+
 ## v1.5.0
 
 - Add support for subscription detachment.