v1.6.0

This is a pre-release to mark the completion of definitions with supporting tests for the following D3 version 4 modules (in alphabetical order):

• d3-brush
• d3-color
• d3-dispatch
• d3-drag
• d3-ease
• d3-interpolate
• d3-path
• d3-scale
• d3-selection
• d3-time
• d3-timer
• d3-transition
• d3-zoom

Completion is referring to the enhanced versions (requiring typescript@next, currently v2.0.0-dev).
Key limitations of this pre-release for the above modules are as follows:

1. module-level definitions do not export directly to a shared d3 global for use in vanilla settings. This is due to export as namespace d3; creating a multiple declaration compile error, when employed at the separate module level.
2. the module definitions are still using relative paths within this staging repo.

Refer to Issues using the module tags to find any open issues specific to a given module.

All other modules are under development or await test file completion.