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

@@ -3176,9 +3176,10 @@ deepmerge@3.1.0:
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-3.1.0.tgz#a612626ce4803da410d77554bfd80361599c034d"
   integrity sha512-/TnecbwXEdycfbsM2++O3eGiatEFHjjNciHEwJclM+T5Kd94qD1AP+2elP/Mq0L5b9VZJao5znR01Mz6eX8Seg==
 
-deepmerge@^2.0.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-2.1.0.tgz#511a54fff405fc346f0240bb270a3e9533a31102"
+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==
 
 defaults@^1.0.0, defaults@^1.0.3:
   version "1.0.3"