v2.9.0

New: Type aliases and optional method parameter flag

@caabernathy added new information to method parameters ( #83 ). If the parameter has a flow type, the name of the type is no also included. I.e. if the type definition is:

export type StatusBarStyle = $Enum<{
     ...
}

the docs for a parameter of that type will include alias: "StatusBarStyle".

In addition the docs now include an optional field indicating whether the parameter is optional or nor.