[Deps] update safe-buffer; downgrade readable-stream

Author: ljharb

package.json

@@ -29,8 +29,8 @@
 	},
 	"dependencies": {
 		"inherits": "^2.0.4",
-		"readable-stream": "^3.6.0",
-		"safe-buffer": "^5.2.0"
+		"readable-stream": "^2.3.8",
+		"safe-buffer": "^5.2.1"
 	},
 	"devDependencies": {
 		"nyc": "^10.3.2",