chore: remove unused deps for now

Author: yyx990803

package.json

@@ -49,9 +49,7 @@
     "file-loader": "^5.0.2",
     "jest": "^24.9.0",
     "lint-staged": "^9.5.0",
-    "memory-fs": "^0.5.0",
     "mini-css-extract-plugin": "^0.8.0",
-    "normalize-newline": "^3.0.0",
     "prettier": "^1.19.1",
     "pug": "^2.0.4",
     "pug-plain-loader": "^1.0.0",
@@ -63,7 +61,6 @@
     "webpack": "^4.41.2",
     "webpack-cli": "^3.3.10",
     "webpack-dev-server": "^3.9.0",
-    "webpack-merge": "^4.2.2",
     "yorkie": "^2.0.0"
   }
 }

yarn.lock

@@ -5302,11 +5302,6 @@ nopt@^4.0.1:
     abbrev "1"
     osenv "^0.1.4"
 
-normalize-newline@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/normalize-newline/-/normalize-newline-3.0.0.tgz#1cbea804aba436001f83938ab21ec039d69ae9d3"
-  integrity sha1-HL6oBKukNgAfg5OKsh7AOdaa6dM=
-
 normalize-package-data@^2.3.2:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"
@@ -7727,13 +7722,6 @@ webpack-log@^2.0.0:
     ansi-colors "^3.0.0"
     uuid "^3.3.2"
 
-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 "^4.17.15"
-
 webpack-sources@^1.1.0, webpack-sources@^1.4.0, webpack-sources@^1.4.1:
   version "1.4.3"
   resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-1.4.3.tgz#eedd8ec0b928fbf1cbfe994e22d2d890f330a933"