update more dev dependencies

to address more high severity security alerts (as per github)

the lodash warning is - supposedly - not serious as not used in production,
however should be addressed in the future, but requires upgrading to Babel 7:
babel/babel#10067 (comment)

Author: pocketjoso

examples/dist/app.js

@@ -40,13 +40,13 @@
     "husky": "^3.0.7",
     "lint-staged": "^9.4.1",
     "prettier": "^1.13.3",
-    "prop-types": "^15.6.1",
-    "react": "^16.8.6",
-    "react-dom": "^16.8.6",
+    "prop-types": "^15.7.2",
+    "react": "^16.10.1",
+    "react-dom": "^16.10.1",
     "react-highlight": "^0.12.0",
-    "react-mt-svg-lines": "^0.8.4",
-    "webpack": "^4.35.2",
-    "webpack-cli": "^3.3.5"
+    "react-mt-svg-lines": "^0.9.1",
+    "webpack": "^4.41.0",
+    "webpack-cli": "^3.3.9"
   },
   "peerDependencies": {
     "react": "^16.0.0",