Install @types/react-router-dom (#95)

Author: mturley

package-lock.json

@@ -31,6 +31,7 @@
     "@types/enzyme": "^3.10.5",
     "@types/enzyme-adapter-react-16": "^1.0.6",
     "@types/jest": "^25.2.3",
+    "@types/react-router-dom": "^5.1.5",
     "@types/victory": "^33.1.4",
     "@typescript-eslint/eslint-plugin": "^3.1.0",
     "@typescript-eslint/parser": "^3.1.0",