upgrade diff package

package.json

@@ -28,13 +28,15 @@
     "semi": true
   },
   "dependencies": {
+    "diff": "^4.0.1",
     "immutable": "3.8.2",
     "lodash": "4.17.11",
     "moment": "2.24.0",
     "papaparse": "4.6.3",
     "prismjs": "1.16.0",
     "react": "16.8.6",
     "react-dom": "16.8.6",
+    "shelljs": "^0.8.3",
     "slate": "0.47.4",
     "slate-plain-serializer": "0.7.6",
     "slate-react": "0.22.4"

yarn.lock

@@ -2119,6 +2119,11 @@ diff@^2.2.1:
   resolved "https://registry.yarnpkg.com/diff/-/diff-2.2.3.tgz#60eafd0d28ee906e4e8ff0a52c1229521033bf99"
   integrity sha1-YOr9DSjukG5Oj/ClLBIpUhAzv5k=
 
+diff@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/diff/-/diff-4.0.1.tgz#0c667cb467ebbb5cea7f14f135cc2dba7780a8ff"
+  integrity sha512-s2+XdvhPCOF01LRQBC8hf4vhbVmI2CGS5aZnxLJlT5FtdhPCDFq80q++zK2KlrVorVDdL5BOGZ/VfLrVtYNF+Q==
+
 diffie-hellman@^5.0.0:
   version "5.0.3"
   resolved "https://registry.yarnpkg.com/diffie-hellman/-/diffie-hellman-5.0.3.tgz#40e8ee98f55a2149607146921c63e1ae5f3d2875"
@@ -6292,7 +6297,7 @@ shebang-regex@^1.0.0:
   resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
   integrity sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=
 
-shelljs@0.8.3:
+shelljs@0.8.3, shelljs@^0.8.3:
   version "0.8.3"
   resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.3.tgz#a7f3319520ebf09ee81275b2368adb286659b097"
   integrity sha512-fc0BKlAWiLpwZljmOvAOTE/gXawtCoNrP5oaY7KIaQbbyHeQVg01pSEuEGvGh3HEdBU4baCD7wQBwADmM/7f7A==