fix: pin eslint-plugin-import to 2.16.0

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
     "codecov": "^3.2.0",
     "eslint": "^5.15.1",
     "eslint-config-airbnb-base": "^13.1.0",
-    "eslint-plugin-import": "^2.16.0",
+    "eslint-plugin-import": "2.16.0",
     "istanbul": "^v1.1.0-alpha.1",
     "mocha": "^5.0.4",
     "mochawesome": "^3.0.2",