bump minify-stream

Author: goto-bus-stop

.travis.yml

@@ -5,6 +5,5 @@ node_js:
   - 10
   - 8
   - 6
-  - 4
 before_install:
   - nvm install-latest-npm

package.json

@@ -12,7 +12,7 @@
     "bundle-collapser": "^1.3.0",
     "common-shakeify": "^0.6.0",
     "dash-ast": "^1.0.0",
-    "minify-stream": "^1.2.1",
+    "minify-stream": "^2.0.1",
     "multisplice": "^1.0.0",
     "through2": "^3.0.1",
     "uglifyify": "^5.0.0",