chore(deps): update dependency webpack-dev-server to v3 [security] (#242)

Author: renovate[bot]

netlify.toml

@@ -0,0 +1,9 @@
+[build]
+  command = "yarn run build && cp build/* releases/"
+  publish = "releases"
+
+  [build.environment]
+    YARN_FLAGS = "--frozen-lockfile"
+    YARN_VERSION = "1.22.4"
+    NODE_VERSION = "12"
+    

package.json

@@ -48,7 +48,7 @@
     "source-map-loader": "^0.2.1",
     "url-loader": "^0.6.2",
     "webpack": "^3.0.0",
-    "webpack-dev-server": "^2.11.1",
+    "webpack-dev-server": "^3.0.0",
     "webpack-node-externals": "^1.6.0"
   },
   "homepage": "https://identity.netlify.com",