enhance function comments

enhance function comments

1.0.0

Features

• add feature to support specifying webContents in broadcast call (521fd33)
• add feature to support specifying webContents in invoke call (efda2d8)
• add support for setting timeout in invoke call (904e16e)

BREAKING CHANGES

• Add IpcEvent as first parameter to listener function in 'on' method

0.3.0

• Add messageCenter.invoke API

0.2.1

docs: release 0.2.1

0.1.0

add getAllListeners

0.0.2

init