chore(spanner): release v1.10.0 (#2827)

diff --git a/internal/version/version.go b/internal/version/version.go
index 8857070..6ebdb54 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 = "20200827"
+const Repo = "20200909"
 
 // Go returns the Go runtime version. The returned string
 // has no whitespace.
diff --git a/spanner/CHANGES.md b/spanner/CHANGES.md
index 130df85..b8d759d 100644
--- a/spanner/CHANGES.md
+++ b/spanner/CHANGES.md
@@ -1,6 +1,18 @@
 # Changes
 
+## v1.10.0
+
+* feat(spanner): add support for NUMERIC data type (#2415)
+* feat(spanner): add custom type support to spanner.Key (#2748)
+* feat(spanner/spannertest): add support for bool parameter types (#2674)
+* fix(spanner): update PDML to take sessions from pool (#2736)
+* spanner/spansql: update docs on TableAlteration, ColumnAlteration (#2825)
+* spanner/spannertest: support dropping columns (#2823)
+* spanner/spannertest: implement GetDatabase (#2802)
+* spanner/spannertest: fix aggregation in query evaluation for empty inputs (#2803)
+
 ## v1.9.0
+
 * Features:
   - feat(spanner): support custom field type (#2614)
 * Bugfixes:
@@ -33,6 +45,7 @@
   - chore(spanner): cleanup mockserver and mockclient (#2414)
 
 ## v1.7.0
+
 * Retry:
   - Only retry certain types of internal errors. (#2460)
 * Tracing/metrics:
@@ -56,6 +69,7 @@
     hc.
 
 ## v1.6.0
+
 * Sessions:
   - Increase the number of sessions in batches instead of one by one when
     additional sessions are needed. The step size is set to 25, which means