Upgrade 8 dependencies (including jest, @babel/core, etc). (#2237)

Summary:
Update misc dependencies to solve vulnerabilities exposed by yarn audit.

Before:
1 Low | 1 Moderate | 1739 High | 1 Critical

After:
1 Low | 15788 High

No changes were necessary in the source files.
Pull Request resolved: #2237

Test Plan:
yarn test

Also played a bit with the rich text editor in the examples folder (uses the built /dist/Draft.js).

Reviewed By: claudiopro

Differential Revision: D18218709

Pulled By: mrkev

fbshipit-source-id: f632b7fb08a15fe86101d726241f9e640cb7e20d

package.json

@@ -36,22 +36,22 @@
     "alex": "^8.0.0",
     "fbjs": "^1.0.0",
     "immutable": "~3.7.4",
-    "object-assign": "^4.1.0"
+    "object-assign": "^4.1.1"
   },
   "peerDependencies": {
     "react": "^0.14.0 || ^15.0.0-rc || ^16.0.0-rc || ^16.0.0",
     "react-dom": "^0.14.0 || ^15.0.0-rc || ^16.0.0-rc || ^16.0.0"
   },
   "devDependencies": {
-    "@babel/core": "^7.3.4",
+    "@babel/core": "^7.6.4",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.4.4",
     "@babel/plugin-proposal-optional-chaining": "^7.6.0",
-    "babel-eslint": "^8.1.1",
-    "babel-preset-fbjs": "^3.2.0",
-    "cross-env": "^5.1.3",
+    "babel-eslint": "^10.0.3",
+    "babel-preset-fbjs": "^3.3.0",
+    "cross-env": "^6.0.3",
     "del": "^2.2.0",
     "envify": "^3.4.0",
-    "es6-shim": "^0.34.4",
+    "es6-shim": "^0.35.5",
     "eslint": "^6.6.0",
     "eslint-config-fbjs": "^3.1.1",
     "eslint-config-prettier": "^6.5.0",
@@ -61,7 +61,7 @@
     "eslint-plugin-prettier": "^3.1.1",
     "eslint-plugin-react": "^7.16.0",
     "eslint-plugin-relay": "^1.3.12",
-    "fbjs-scripts": "^1.1.0",
+    "fbjs-scripts": "^1.2.0",
     "flow-bin": "^0.92.0",
     "gulp": "^4.0.0",
     "gulp-babel": "^8.0.0",
@@ -74,7 +74,7 @@
     "gulp-rename": "^1.2.2",
     "gulp-uglify": "^1.2.0",
     "gulp-util": "^3.0.6",
-    "jest": "^24.1.0",
+    "jest": "^24.9.0",
     "prettier": "1.13.6",
     "react": "^16.8.0",
     "react-dom": "^16.8.0",