chore(package): update rollup-plugin-typescript2 to version 0.18.0 (#257)

Author: greenkeeper[bot]

package.json

@@ -106,7 +106,7 @@
     "rollup-plugin-json": "^3.1.0",
     "rollup-plugin-node-resolve": "^3.4.0",
     "rollup-plugin-sourcemaps": "^0.4.2",
-    "rollup-plugin-typescript2": "^0.17.0",
+    "rollup-plugin-typescript2": "^0.18.0",
     "semantic-release": "^15.9.16",
     "ts-jest": "^23.10.2",
     "ts-node": "^7.0.1",