Update multiple dependencies. (#955)

package.json

@@ -39,7 +39,7 @@
     "@emotion/core": "^10.0.10",
     "@emotion/styled": "^10.0.11",
     "@khanacademy/react-multi-select": "^0.3.3",
-    "auth0-js": "9.11.3",
+    "auth0-js": "9.12.1",
     "bluebird": "^3.5.3",
     "bootstrap": "3.4.1",
     "classnames": "^2.2.5",
@@ -67,12 +67,12 @@
     "react-bootstrap-table-next": "2.2.0",
     "react-breadcrumbs": "2.1.7",
     "react-datepicker": "1.6.0",
-    "react-dom": "16.9.0",
+    "react-dom": "16.12.0",
     "react-gravatar": "2.6.3",
     "react-markdown": "^4.1.0",
     "react-redux": "6.0.1",
-    "react-router": "5.0.1",
-    "react-router-dom": "5.0.1",
+    "react-router": "5.1.2",
+    "react-router-dom": "5.1.2",
     "react-test-renderer": "^16.12.0",
     "react-timeout": "1.2.0",
     "react-transition-group": "^4.3.0",
@@ -82,14 +82,14 @@
     "redux-thunk": "2.3.0",
     "semver-compare": "1.0.0",
     "serialize-javascript": "^2.1.1",
-    "superagent": "5.1.3",
+    "superagent": "5.2.1",
     "superagent-bluebird-promise": "4.2.0",
     "underscore": "1.9.2",
-    "validate.js": "0.12.0"
+    "validate.js": "0.13.1"
   },
   "devDependencies": {
-    "@babel/core": "7.5.5",
-    "@babel/preset-env": "7.5.5",
+    "@babel/core": "7.7.7",
+    "@babel/preset-env": "7.7.7",
     "@babel/preset-react": "^7.0.0",
     "@testing-library/jest-dom": "^4.1.0",
     "@testing-library/react": "9.4.0",
@@ -114,10 +114,10 @@
     "file-loader": "5.0.2",
     "fstream": "1.0.12",
     "html-webpack-plugin": "^3.2.0",
-    "husky": "^3.1.0",
+    "husky": "4.0.1",
     "jest": "^24.8.0",
     "json-loader": "^0.5.7",
-    "mini-css-extract-plugin": "^0.7.0",
+    "mini-css-extract-plugin": "^0.9.0",
     "nock": "^11.3.4",
     "node-sass": "4.13.0",
     "optimize-css-assets-webpack-plugin": "^5.0.3",
@@ -132,9 +132,9 @@
     "stylelint-config-styled-components": "^0.1.1",
     "stylelint-processor-styled-components": "^1.8.0",
     "url-loader": "3.0.0",
-    "webpack": "4.39.3",
+    "webpack": "4.41.5",
     "webpack-cli": "^3.3.5",
-    "webpack-dev-server": "3.8.0",
+    "webpack-dev-server": "3.10.1",
     "webpack-merge": "^4.2.1"
   },
   "husky": {