Update version to v1.2.0 (#252)

Divjot Arora · web-flow · commit b414b8974576 · 2019-12-10T10:53:12.000-08:00
diff --git a/version/version.go b/version/version.go
@@ -7,4 +7,4 @@
 package version // import "go.mongodb.org/mongo-driver/version"
 
 // Driver is the current version of the driver.
-var Driver = "v1.1.1+prerelease"
+var Driver = "v1.2.0"
