Release v1.7.0 (#515)

diff --git a/CHANGELOG b/CHANGELOG
index 3b1e526..9404c57 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,13 @@
+v1.7.0
+  Version 1.7.0
+
+  This release drops the hard requirement on oauth2client and installs
+  google-auth by default instead. oauth2client is still supported but will
+  need to be explicitly installed.
+
+  - Drop oauth2client dependency (#499)
+  - Include tests in source distribution (#514)
+
 v1.6.7
   Version 1.6.7