By moving to wasm-bindgens `bundler` target rather than using the `web`
target we remove the need for an async initialization step on the
automerge-wasm package. This means that the automerge-js package can now
depend directly on automerge-wasm and perform initialization itself,
thus making automerge-js a drop in replacement for the `automerge` JS
package (hopefully).
We bump the versions of automerge-wasm and automerge-types.
