Merge pull request smasher164#29 from smasher164/mention-wpctl

mention wpctl in README

Merge pull request smasher164#22 from smasher164/release-version-0.4.0

bump Cargo.toml version to 0.4.0

Merge pull request smasher164#15 from smasher164/fix-changing-lower-v…

…olume

set sink volume instead of stream volume

Merge pull request smasher164#10 from smasher164/pw-channelVolumes

change channelVolumes instead of volume

Merge pull request smasher164#3 from ThinkChaos/fix-node-enum-format

Fix NodeEnumFormat