refactor: switch to react-dom/test-utils from react-addons-test-utils

* Original commit: 6aae839
* Original author: @KagamiChan
* Closes #108

Author: KagamiChan

package.json

@@ -75,7 +75,6 @@
     "prismjs": "^1.6.0",
     "raw-loader": "^0.5.1",
     "react": "^15.6.1",
-    "react-addons-test-utils": "^15.6.0",
     "react-github-fork-ribbon": "^0.5.0",
     "react-scripts": "^1.0.11",
     "rimraf": "^2.6.1",

src/lib/ToastContainer.test.js

@@ -8,7 +8,7 @@ import {
 
 import {
   default as TestUtils,
-} from "react-addons-test-utils";
+} from "react-dom/test-utils";
 
 import {
   ToastContainer,

yarn.lock

@@ -5683,10 +5683,6 @@ rc@^1.0.1, rc@^1.1.6, rc@^1.1.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-react-addons-test-utils@^15.6.0:
-  version "15.6.0"
-  resolved "https://registry.yarnpkg.com/react-addons-test-utils/-/react-addons-test-utils-15.6.0.tgz#062d36117fe8d18f3ba5e06eb33383b0b85ea5b9"
-
 react-dev-utils@^3.1.0:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/react-dev-utils/-/react-dev-utils-3.1.1.tgz#09ae7209a81384248db56547e718e65bd3b20eb5"