build: update dependency deepmerge to v4

Author: renovate-bot

packages/hn/package.json

@@ -11,7 +11,7 @@
   "license": "MIT",
   "dependencies": {
     "babel-runtime": "^6.26.0",
-    "deepmerge": "^2.0.0",
+    "deepmerge": "^4.0.0",
     "fetch-ponyfill": "^6.0.0",
     "get-nested": "^4.0.0",
     "isomorphic-fetch": "^2.2.1",

yarn.lock

@@ -3320,15 +3320,11 @@ deep-is@~0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
 
-[email protected]:
+[email protected], deepmerge@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-4.0.0.tgz#3e3110ca29205f120d7cb064960a39c3d2087c09"
   integrity sha512-YZ1rOP5+kHor4hMAH+HRQnBQHg+wvS1un1hAOuIcxcBy0hzcUf6Jg2a1w65kpoOUnurOfZbERwjI1TfZxNjcww==
 
-deepmerge@^2.0.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-2.1.0.tgz#511a54fff405fc346f0240bb270a3e9533a31102"
-
 defaults@^1.0.0, defaults@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/defaults/-/defaults-1.0.3.tgz#c656051e9817d9ff08ed881477f3fe4019f3ef7d"