Update to use rollup.js

Thanks @ljmerza!

package.json

@@ -1,7 +1,7 @@
 {
     "name": "boilerplate-card",
     "version": "1.0.0",
-    "description": "A templatable config pass-through",
+    "description": "Lovelace boilerplate-card",
     "keywords": [
         "home-assistant",
         "homeassistant",
@@ -10,26 +10,28 @@
         "lovelace",
         "custom-cards"
     ],
-    "umd:main": "boilerplate-card.js",
+    "module": "boilerplate-card.js",
     "repository": "git@github.com:custom_cards/boilerplate-card.git",
-    "author": "Ian Richardson <iantrich@gmail.com>",
+    "author": "BoilerPlate <boilerplate@email.com>",
     "license": "MIT",
     "dependencies": {
         "lit-element": "^2.0.1"
     },
     "devDependencies": {
+        "@typescript-eslint/parser": "^1.4.1",
+        "eslint": "^5.14.1",
+        "eslint-plugin-typescript": "^0.14.0",
         "microbundle": "^0.10.1",
         "prettier": "^1.16.4",
-        "tslib": "^1.9.3",
-        "tslint": "^5.12.1",
-        "tslint-config-prettier": "^1.18.0",
-        "tslint-eslint-rules": "^5.4.0",
-        "tslint-plugin-prettier": "^2.0.1",
+        "rollup": "^1.2.3",
+        "rollup-plugin-node-resolve": "^4.0.1",
+        "rollup-plugin-typescript2": "^0.19.2",
         "typescript": "^3.3.3333"
     },
     "scripts": {
-        "start": "microbundle watch",
-        "build": "npm run lint && microbundle --external litElement --target browser --format umd",
-        "lint": "tslint index.ts"
+        "start": "rollup -c --watch",
+        "build": "npm run lint && npm run rollup",
+        "lint": "eslint src/index.ts",
+        "rollup": "rollup -c"
     }
 }