Bump webpack-merge from 2.6.1 to 4.2.2 (shentao#1105)

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 2.6.1 to 4.2.2.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/master/CHANGELOG.md)
- [Commits](survivejs/webpack-merge@v2.6.1...v4.2.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

package.json

@@ -86,7 +86,7 @@
     "webpack-bundle-analyzer": "^3.5.1",
     "webpack-dev-middleware": "^1.10.0",
     "webpack-hot-middleware": "^2.16.1",
-    "webpack-merge": "^2.6.1"
+    "webpack-merge": "^4.2.2"
   },
   "license": "MIT",
   "homepage": "https://shentao.github.io/vue-multiselect/",

yarn.lock

@@ -11705,19 +11705,12 @@ webpack-log@^2.0.0:
     ansi-colors "^3.0.0"
     uuid "^3.3.2"
 
-webpack-merge@^2.6.1:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/webpack-merge/-/webpack-merge-2.6.1.tgz#f1d801d2c5d39f83ffec9f119240b3e3be994a1c"
-  integrity sha1-8dgB0sXTn4P/7J8RkkCz476ZShw=
-  dependencies:
-    lodash "^4.17.4"
-
-webpack-merge@^4.1.3:
-  version "4.1.4"
-  resolved "https://registry.yarnpkg.com/webpack-merge/-/webpack-merge-4.1.4.tgz#0fde38eabf2d5fd85251c24a5a8c48f8a3f4eb7b"
-  integrity sha512-TmSe1HZKeOPey3oy1Ov2iS3guIZjWvMT2BBJDzzT5jScHTjVC3mpjJofgueEzaEd6ibhxRDD6MIblDr8tzh8iQ==
+webpack-merge@^4.1.3, webpack-merge@^4.2.2:
+  version "4.2.2"
+  resolved "https://registry.yarnpkg.com/webpack-merge/-/webpack-merge-4.2.2.tgz#a27c52ea783d1398afd2087f547d7b9d2f43634d"
+  integrity sha512-TUE1UGoTX2Cd42j3krGYqObZbOD+xF7u28WB7tfUordytSjbWTIjK/8V0amkBfTYN4/pB/GIDlJZZ657BGG19g==
   dependencies:
-    lodash "^4.17.5"
+    lodash "^4.17.15"
 
 webpack-sources@^0.1.0:
   version "0.1.5"