v3.4.0

Features:

• Add Promise.version which tells the bluebird version as a string e.g. "3.4.0" (#1042).
• .map, Promise.map, .filter and Promise.filter now return rejected promise when inappropriate options argument is passed (#1097).

Bugfixes:

• Fix bug where callback to .disposer is not called if the resource is null (#1099).
• Fix bug where assimilating thenable throws unexpectedly when using hostile host objects as thenables (#1104).