Switch to React 16.8

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

package.json

@@ -68,6 +68,7 @@
     "babel-runtime": "^6.26.0",
     "bluebird": "^3.5.2",
     "browser-request": "^0.3.3",
+    "create-react-class": "^15.6.0",
     "draft-js": "^0.11.0-alpha",
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "favico.js": "^0.3.10",
@@ -78,9 +79,9 @@
     "matrix-react-sdk": "1.4.0",
     "modernizr": "^3.6.0",
     "olm": "https://packages.matrix.org/npm/olm/olm-3.1.0.tgz",
-    "prop-types": "^15.6.2",
-    "react": "^15.6.0",
-    "react-dom": "^15.6.0",
+    "prop-types": "^15.7.2",
+    "react": "^16.8.6",
+    "react-dom": "^16.8.6",
     "sanitize-html": "^1.19.1",
     "ua-parser-js": "^0.7.19",
     "url": "^0.11.0"
@@ -144,8 +145,6 @@
     "postcss-scss": "^1.0.6",
     "postcss-simple-vars": "^4.1.0",
     "postcss-strip-inline-comments": "^0.1.5",
-    "react-addons-perf": "^15.4.0",
-    "react-addons-test-utils": "^15.6.0",
     "rimraf": "^2.4.3",
     "source-map-loader": "^0.2.4",
     "webpack": "^4.23.1",