Upgrade webpack, webpack-bundle-analyzer, offline-plugin
Upgrade webpack, webpack-bundle-analyzer, offline-plugin

Changes to webpack look to be mostly irrelevant / webassembly-related;
offline-plugin is just a patchlevel; webpack-bundle-analyzer changes are
also fairly uninteresting.

popcodeorg/popcode,popcodeorg/popcode,popcodeorg/popcode,outoftime/learnpad,jwang1919/popcode,jwang1919/popcode,jwang1919/popcode,jwang1919/popcode,popcodeorg/popcode,outoftime/learnpad