wasm-pack build creates incomplete file list in package.json

[PSeitz]

🐛 Bug description

wasm-pack build creates incomplete file list in package.json.

lz4_wasm_bg.js is missing in package.json, but is referenced in lz4_wasm.js (export * from "./lz4_wasm_bg.js")

👟 Steps to reproduce

git clone https://github.com/PSeitz/lz4_flex
cd lz4-wasm
wasm-pack build
wasm-pack pack

"lz4_wasm_bg.js" is missing in package.json, but is referenced in "lz4_wasm.js" (export * from "./lz4_wasm_bg.js").
Manually adding the file to the list solves the issue.

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: wasm-pack 0.9.1
rustc version: rustc 1.44.0-nightly (b2e36e6c2 2020-04-22)

[lucashorward]

Same issue as #881, and should also be resolved through #839, but that hasn't been released as a new version yet.