deps: make @types/readable-stream a standard dependency (#133)

Author: kyle-johnson

package.json

@@ -28,12 +28,12 @@
     "awesomesauce"
   ],
   "dependencies": {
+    "@types/readable-stream": "^4.0.0",
     "buffer": "^6.0.3",
     "inherits": "^2.0.4",
     "readable-stream": "^4.2.0"
   },
   "devDependencies": {
-    "@types/readable-stream": "^4.0.0",
     "faucet": "~0.0.1",
     "standard": "^17.0.0",
     "tape": "^5.2.2",