chore: dependencies update

- chore: update `core-js` to `2.6.1`
- chore: update `enzyme` to `3.8.0`
- chore: update `enzyme-adapter-react-16` to `1.7.1`
- chore: update `eslint` to `5.10.0`
- chore: update `react` to `16.7.0`
- chore: update `react-dom` to `16.7.0`

Author: xidedix

package.json

@@ -50,14 +50,14 @@
   },
   "devDependencies": {
     "babel-eslint": "^10.0.1",
-    "enzyme": "^3.7.0",
-    "enzyme-adapter-react-16": "^1.7.0",
-    "eslint": "^5.9.0",
+    "enzyme": "^3.8.0",
+    "enzyme-adapter-react-16": "^1.7.1",
+    "eslint": "^5.10.0",
     "eslint-plugin-import": "^2.14.0",
     "eslint-plugin-react": "^7.11.1",
     "nwb": "^0.23.0",
-    "react": "^16.6.3",
-    "react-dom": "^16.6.3",
+    "react": "^16.7.0",
+    "react-dom": "^16.7.0",
     "sinon": "^5.1.1"
   },
   "repository": {