fix: get release args from pkg

Get the version and file using node rather than env vars.
Pkg main was broken in npm v > 7.

Author: timhaywood

templates/typescript/package.json

@@ -8,7 +8,7 @@
     "tsc": "tsc",
     "build": "rollup -c",
     "watch": "rollup -cw",
-    "release": "npm run build && gh release create $npm_package_version $npm_package_main"
+    "release": "npm run build && gh release create $(node -pe \"require('./package.json').version\") $(node -pe \"require('./package.json').main\")"
   },
   "repository": {
     "type": "git",