params: begin Geth v1.9.1 release cycle

params/version.go

@@ -21,10 +21,10 @@ import (
 )
 
 const (
-	VersionMajor = 1        // Major version component of the current release
-	VersionMinor = 9        // Minor version component of the current release
-	VersionPatch = 0        // Patch version component of the current release
-	VersionMeta  = "stable" // Version metadata to append to the version string
+	VersionMajor = 1          // Major version component of the current release
+	VersionMinor = 9          // Minor version component of the current release
+	VersionPatch = 1          // Patch version component of the current release
+	VersionMeta  = "unstable" // Version metadata to append to the version string
 )
 
 // Version holds the textual version string.