breaking: bump version requirements (#138)

* break: raise peer versions

* break: define `engines` constraint;

- matches Rollup 2.x requirement

* chore: update lock file

Author: lukeed

package-lock.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "eslint": "^6.8.0",
     "locate-character": "^2.0.5",
-    "rollup": "^1.32.1",
+    "rollup": "^2.30.0",
     "sander": "^0.6.0",
     "source-map": "^0.7.3",
     "svelte": "^3.24.0",
@@ -41,7 +41,10 @@
     "sourcemap-codec": "^1.4.8"
   },
   "peerDependencies": {
-    "svelte": "*",
-    "rollup": ">=1.19.2"
+    "svelte": ">=3.5.0",
+    "rollup": ">=2.0.0"
+  },
+  "engines": {
+    "node": ">=10"
   }
 }