v3.0.0

• createIndex and dropIndex are only available on Replicache class (no longer part of a WriteTransaction).
• Better handling of the wasm file when using Webpack (see sample/next).
• Fixed issue when a mutator was missing which lead to an iloop.
• When scanning over an index, the result key is tuple of [secondary, primary]. Similarly when starting a scan over an index at a key you can now provide a tuple.