Update Rollup to use HMR with Sapper

package.json

@@ -9,8 +9,8 @@
   },
   "private": true,
   "scripts": {
-    "dev": "sapper dev",
-    "build": "sapper build dist --legacy",
+    "dev": "sapper dev --port 3000",
+    "build": "sapper build dist",
     "export": "sapper export export",
     "start": "node __sapper__/build",
     "serve": "node server/server.js"
@@ -20,42 +20,41 @@
     "animejs": "^3.1.0",
     "bulma": "^0.8.0",
     "compression": "^1.7.4",
-    "dayjs": "^1.8.18",
+    "dayjs": "^1.8.19",
     "normalize.css": "^8.0.1",
     "polka": "^1.0.0-next.9",
     "shufflejs": "^5.2.3",
     "sirv": "^0.4.2"
   },
   "devDependencies": {
-    "@babel/core": "^7.7.7",
-    "@babel/plugin-syntax-dynamic-import": "^7.7.4",
-    "@babel/plugin-transform-runtime": "^7.7.6",
-    "@babel/preset-env": "^7.7.7",
-    "@babel/runtime": "^7.7.7",
-    "@rollup/plugin-node-resolve": "^6.0.0",
-    "@rollup/plugin-replace": "^2.3.0",
-    "autoprefixer": "^9.7.3",
+    "@babel/core": "^7.8.4",
+    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
+    "@babel/plugin-transform-runtime": "^7.8.3",
+    "@babel/preset-env": "^7.8.4",
+    "@babel/runtime": "^7.8.4",
+    "@rollup/plugin-commonjs": "^11.0.2",
+    "@rollup/plugin-node-resolve": "^7.1.1",
+    "@rollup/plugin-replace": "^2.3.1",
+    "autoprefixer": "^9.7.4",
     "eslint-plugin-svelte3": "^2.7.3",
-    "node-sass": "^4.13.0",
+    "node-sass": "^4.13.1",
     "postcss": "^7.0.26",
     "postcss-load-config": "^2.1.0",
     "postcss-preset-env": "^6.7.0",
-    "rollup": "^1.27.14",
+    "rollup": "^1.31.0",
     "rollup-plugin-babel": "^4.3.3",
     "rollup-plugin-commonjs": "^10.1.0",
+    "rollup-plugin-hot": "^0.0.10",
     "rollup-plugin-svelte": "^5.1.1",
-    "rollup-plugin-terser": "^5.1.3",
+    "rollup-plugin-svelte-hot": "^0.1.1",
+    "rollup-plugin-terser": "^5.2.0",
     "sapper": "^0.27.9",
-    "sass": "^1.24.0",
-    "svelte": "^3.16.7",
-    "svelte-preprocess": "^3.3.0"
+    "svelte": "^3.18.1",
+    "svelte-preprocess": "^3.4.0"
   },
   "browserslist": [
-    "ie >= 11",
-    "last 7 ff versions",
-    "last 7 chrome versions",
-    "safari >= 10",
-    "ios >= 11",
-    "android >= 7"
+    "> 0.5%",
+    "last 2 versions",
+    "not dead"
   ]
 }