all: start v1.36.7-devel

Change-Id: Ie1d1bdcb5e5ff17052da981d37e089887e96ba71
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/693516
Reviewed-by: Lasse Folger <lassefolger@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
diff --git a/internal/version/version.go b/internal/version/version.go
index a53364c..8626e06 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -53,7 +53,7 @@
 	Major      = 1
 	Minor      = 36
 	Patch      = 7
-	PreRelease = ""
+	PreRelease = "devel"
 )
 
 // String formats the version string for this module in semver format.