Enable js feature for getrandom so it builds for WASM browser targets.
By default rand does not build for WASM browser targets.
The following crates pass cargo check --target wasm32-unknown-unknown only after applying this change
tor-bytes tor-cell tor-cert tor-checkable tor-consdiff tor-linkspec tor-llcrypto tor-netdir tor-netdoc tor-proto tor-socksproto