Update react, react-dom, and react-test-renderer to 15.6.2

package.json

@@ -138,9 +138,9 @@
     "pumpify": "^1.3.4",
     "qrcode-npm": "0.0.3",
     "ramda": "^0.24.1",
-    "react": "^15.0.2",
+    "react": "^15.6.2",
     "react-addons-css-transition-group": "^15.6.0",
-    "react-dom": "^15.5.4",
+    "react-dom": "^15.6.2",
     "react-hyperscript": "^3.0.0",
     "react-markdown": "^2.3.0",
     "react-redux": "^5.0.5",
@@ -226,7 +226,7 @@
     "qs": "^6.2.0",
     "qunitjs": "^2.4.1",
     "react-addons-test-utils": "^15.5.1",
-    "react-test-renderer": "^15.5.4",
+    "react-test-renderer": "^15.6.2",
     "react-testutils-additions": "^15.2.0",
     "redux-test-utils": "^0.1.3",
     "sinon": "^4.0.0",