Update version to v1.3.1+prerelease

Divjot Arora · Divjot Arora · commit 4f49fb3363c9 · 2020-02-05T08:54:43.000-08:00
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 = "v1.3.0"
+var Driver = "v1.3.1+prerelease"
