chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -7585,10 +7585,10 @@ webpack-sources@^1.4.0, webpack-sources@^1.4.1:
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@^4.39.1:
-  version "4.39.1"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.39.1.tgz#60ed9fb2b72cd60f26ea526c404d2a4cc97a1bd8"
-  integrity sha512-/LAb2TJ2z+eVwisldp3dqTEoNhzp/TLCZlmZm3GGGAlnfIWDgOEE758j/9atklNLfRyhKbZTCOIoPqLJXeBLbQ==
+webpack@^4.40.2:
+  version "4.40.2"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.40.2.tgz#d21433d250f900bf0facbabe8f50d585b2dc30a7"
+  integrity sha512-5nIvteTDCUws2DVvP9Qe+JPla7kWPPIDFZv55To7IycHWZ+Z5qBdaBYPyuXWdhggTufZkQwfIK+5rKQTVovm2A==
   dependencies:
     "@webassemblyjs/ast" "1.8.5"
     "@webassemblyjs/helper-module-context" "1.8.5"