Upgrade minimum react-addons-test-utils version 15.4.2

package.json

@@ -73,7 +73,7 @@
     "postcss-loader": "0.11.1",
     "promise": "7.1.1",
     "raw-loader": "^0.5.1",
-    "react-addons-test-utils": "^15.3.1",
+    "react-addons-test-utils": "^15.4.2",
     "react-hot-loader": "^3.0.0-beta.3",
     "recursive-readdir": "2.0.0",
     "rimraf": "2.5.4",

yarn.lock

@@ -154,10 +154,6 @@ acorn-jsx@^3.0.0, acorn-jsx@^3.0.1:
   dependencies:
     acorn "^3.0.4"
 
-acorn@^2.1.0, acorn@^2.4.0:
-  version "2.7.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-2.7.0.tgz#ab6e7d9d886aaca8b085bc3312b79a198433f0e7"
-
 acorn@^3.0.0, acorn@^3.0.4, acorn@^3.1.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
@@ -3030,7 +3026,7 @@ https-browserify@0.0.0:
   version "0.0.0"
   resolved "https://registry.yarnpkg.com/https-browserify/-/https-browserify-0.0.0.tgz#b3ffdfe734b2a3d4a9efd58e8654c91fce86eafd"
 
-iconv-lite@0.4.13, iconv-lite@^0.4.13, iconv-lite@^0.4.5, iconv-lite@~0.4.13:
+iconv-lite@0.4.13, iconv-lite@^0.4.5, iconv-lite@~0.4.13:
   version "0.4.13"
   resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.13.tgz#1f88aba4ab0b1508e8312acc39345f36e992e2f2"
 
@@ -5050,9 +5046,12 @@ react-addons-css-transition-group@^15.3.2:
   version "15.3.2"
   resolved "https://registry.yarnpkg.com/react-addons-shallow-compare/-/react-addons-shallow-compare-15.3.2.tgz#c9edba49b9eab44d0c59024d289beb1ab97318b5"
 
-react-addons-test-utils@^15.3.1:
-  version "15.3.2"
-  resolved "https://registry.yarnpkg.com/react-addons-test-utils/-/react-addons-test-utils-15.3.2.tgz#c09a44f583425a4a9c1b38444d7a6c3e6f0f41f6"
+react-addons-test-utils@^15.4.2:
+  version "15.4.2"
+  resolved "https://registry.yarnpkg.com/react-addons-test-utils/-/react-addons-test-utils-15.4.2.tgz#93bcaa718fcae7360d42e8fb1c09756cc36302a2"
+  dependencies:
+    fbjs "^0.8.4"
+    object-assign "^4.1.0"
 
 react-autosuggest@^8.0.0:
   version "8.0.0"