bump up version to v1.18.8 (#1655)

* fix for crash in lambda function cft yaml if code key is not present

* removed duplicate tag image tag

* bump up the version to 1.18.5

* added feature to parse cft template for ssm parameter

* bumped the version to 1.18.7

* bump up version to v1.18.8

pkg/version/version.go

@@ -19,7 +19,7 @@ package version
 import "fmt"
 
 // Terrascan The Terrascan version
-const Terrascan = "1.18.7"
+const Terrascan = "1.18.8"
 
 // Get returns the terrascan version
 func Get() string {