Include declarations in npm package (#73)

Author: andrea-guarino-sonarsource

package.json

@@ -3,6 +3,7 @@
   "version": "0.1.1",
   "description": "SonarJS rules for ESLint",
   "main": "lib/index.js",
+  "types": "lib/index.d.ts",
   "repository": "[email protected]:SonarSource/eslint-plugin-sonarjs.git",
   "license": "LGPL-3.0",
   "keywords": ["sonarjs", "eslint", "eslintplugin"],
@@ -14,7 +15,7 @@
     "node": ">=6"
   },
   "scripts": {
-    "build": "rimraf lib && tsc -p tsconfig-src.json",
+    "build": "rimraf lib && tsc -d -p tsconfig-src.json",
     "test": "jest",
     "ruling": "ts-node ruling/index.ts",
     "typecheck": "tsc -p tsconfig.json",