fix(package): run rollup command before publishing

Author: tusharmath

package.json

@@ -9,7 +9,7 @@
     "coverage": "nyc npm test && nyc report --reporter=text-lcov | coveralls",
     "hydra": "node --trace-hydrogen --trace-phase=Z --trace-deopt --code-comments --hydrogen-track-positions --redirect-code-traces --redirect-code-traces-to=code.asm chore/benchmark.js",
     "lint": "tslint ./src/**.ts ./src/**/*.ts ./test/*.ts",
-    "prepublish": "tsc",
+    "prepublish": "tsc && npm run build",
     "rfc": "node chore/rfc",
     "semantic-release": "semantic-release pre && npm publish && semantic-release post",
     "test": "tsc && ava",