upgrade deps to match newer sapper deps

Author: hchiam

package.json

@@ -26,7 +26,7 @@
     "polka": "next",
     "redux": "^4.0.5",
     "shepherd.js": "^7.1.5",
-    "sirv": "^0.4.0",
+    "sirv": "^1.0.0",
     "svelte-highlight": "^0.6.0"
   },
   "devDependencies": {
@@ -35,15 +35,16 @@
     "@babel/plugin-transform-runtime": "^7.0.0",
     "@babel/preset-env": "^7.0.0",
     "@babel/runtime": "^7.0.0",
-    "@rollup/plugin-commonjs": "11.0.2",
-    "@rollup/plugin-node-resolve": "^7.0.0",
+    "@rollup/plugin-babel": "^5.0.0",
+    "@rollup/plugin-commonjs": "^14.0.0",
+    "@rollup/plugin-node-resolve": "^8.0.0",
     "@rollup/plugin-replace": "^2.2.0",
     "husky": "^4.2.5",
     "npm-run-all": "^4.1.5",
-    "rollup": "^1.20.0",
+    "rollup": "^2.3.4",
     "rollup-plugin-babel": "^4.0.2",
     "rollup-plugin-svelte": "^5.0.1",
-    "rollup-plugin-terser": "^5.3.0",
+    "rollup-plugin-terser": "^6.1.0",
     "sapper": "^0.27.0",
     "svelte": "^3.0.0",
     "svelte-lazy": "^0.1.11"