remove typescript in favour of sucrase

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sapper",
-  "version": "0.26.0-alpha.3",
+  "version": "0.26.0-alpha.4",
   "description": "Military-grade apps, engineered by Svelte",
   "bin": {
     "sapper": "./sapper"
@@ -56,15 +56,12 @@
     "rollup-plugin-string": "^2.0.2",
     "rollup-plugin-sucrase": "^2.1.0",
     "rollup-plugin-svelte": "^5.0.1",
-    "rollup-plugin-typescript": "^1.0.0",
     "sade": "^1.4.2",
     "sander": "^0.6.0",
     "sirv": "^0.2.2",
     "sucrase": "^3.9.5",
     "svelte": "^3.0.0-alpha27",
     "svelte-loader": "^2.12.0",
-    "ts-node": "^8.0.2",
-    "typescript": "^3.3.1",
     "webpack": "^4.29.0",
     "webpack-format-messages": "^2.0.5",
     "yootils": "0.0.14"