fix envAsHeader to set the req Header from kv[1] instead of os.Getenv(name) (#225)

fnctl/routes.go

@@ -151,7 +151,7 @@ func envAsHeader(req *http.Request, selectedEnv []string) {
 	for _, e := range detectedEnv {
 		kv := strings.Split(e, "=")
 		name := kv[0]
-		req.Header.Set(name, os.Getenv(name))
+		req.Header.Set(name, kv[1])
 	}
 }