Update to 2.8.0 manually because of greenkeeper test error.

package.json

@@ -45,7 +45,7 @@
     "enzyme-adapter-react-16": "1.1.0",
     "eslint": "^4.7.1",
     "eslint-config-scratch": "^5.0.0",
-    "eslint-plugin-import": "^2.7.0",
+    "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-react": "^7.5.1",
     "file-loader": "1.1.6",
     "get-float-time-domain-data": "0.1.0",