upgrade libs

* file-loader
* null-loader

package.json

@@ -162,7 +162,7 @@
     "eslint-plugin-chai-friendly": "^0.4.1",
     "eslint-plugin-import": "^2.16.0",
     "eslint-plugin-react": "^7.12.4",
-    "file-loader": "^3.0.1",
+    "file-loader": "^4.0.0",
     "handsontable": "^6.0.1",
     "i18next-browser-languagedetector": "^3.0.1",
     "imports-loader": "^0.8.0",
@@ -189,7 +189,7 @@
     "node-sass": "^4.11.0",
     "nodelist-foreach-polyfill": "^1.2.0",
     "normalize-path": "^3.0.0",
-    "null-loader": "^2.0.0",
+    "null-loader": "^3.0.0",
     "on-headers": "^1.0.1",
     "optimize-css-assets-webpack-plugin": "^5.0.0",
     "penpal": "^4.0.0",

yarn.lock

@@ -4167,11 +4167,12 @@ file-entry-cache@^5.0.1:
   dependencies:
     flat-cache "^2.0.1"
 
-file-loader@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/file-loader/-/file-loader-3.0.1.tgz#f8e0ba0b599918b51adfe45d66d1e771ad560faa"
+file-loader@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/file-loader/-/file-loader-4.0.0.tgz#c3570783fefb6e1bc0978a856f4bf5825b966c2a"
+  integrity sha512-roAbL6IdSGczwfXxhMi6Zq+jD4IfUpL0jWHD7fvmjdOVb7xBfdRUHe4LpBgO23VtVK5AW1OlWZo0p34Jvx3iWg==
   dependencies:
-    loader-utils "^1.0.2"
+    loader-utils "^1.2.2"
     schema-utils "^1.0.0"
 
 file-selector@^0.1.11:
@@ -6220,7 +6221,7 @@ loader-utils@^1.0.1, loader-utils@^1.0.2, loader-utils@^1.1.0:
     emojis-list "^2.0.0"
     json5 "^0.5.0"
 
-loader-utils@^1.2.3:
+loader-utils@^1.2.2, loader-utils@^1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-1.2.3.tgz#1ff5dc6911c9f0a062531a4c04b609406108c2c7"
   integrity sha512-fkpz8ejdnEMG3s37wGL07iSBDg99O9D5yflE9RGNH3hRdx9SOwYfnGYdZOUIZitN8E+E2vkq3MUMYMvPYl5ZZA==
@@ -7435,10 +7436,10 @@ nth-check@^1.0.1:
   dependencies:
     boolbase "~1.0.0"
 
-null-loader@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/null-loader/-/null-loader-2.0.0.tgz#1c99da3f0d2c0996b51e9eada3a898a5d57472aa"
-  integrity sha512-PhEeA3v/tAacxC5dNO1i2yXzGVWWrZ9jTx+TMEJ716amvnBXzvrxIwy9HW7MyJsHe8ACQzpiQgbrAjDRMA7gcg==
+null-loader@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/null-loader/-/null-loader-3.0.0.tgz#3e2b6c663c5bda8c73a54357d8fa0708dc61b245"
+  integrity sha512-hf5sNLl8xdRho4UPBOOeoIwT3WhjYcMUQm0zj44EhD6UscMAz72o2udpoDFBgykucdEDGIcd6SXbc/G6zssbzw==
   dependencies:
     loader-utils "^1.2.3"
     schema-utils "^1.0.0"