swarm/version: bump version due to Geth hotfix release

swarm/version/version.go

@@ -23,7 +23,7 @@ import (
 const (
 	VersionMajor = 0          // Major version component of the current release
 	VersionMinor = 3          // Minor version component of the current release
-	VersionPatch = 15         // Patch version component of the current release
+	VersionPatch = 16         // Patch version component of the current release
 	VersionMeta  = "unstable" // Version metadata to append to the version string
 )