chore(package): update rollup to version 2.10.7

Closes #122

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "graphql-tools": "4.0.4",
     "jest": "24.9.0",
     "rimraf": "2.6.3",
-    "rollup": "^1.10.1",
+    "rollup": "^2.10.7",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "ts-jest": "24.1.0",
     "tslint": "5.20.0",