yank in visual mode doesn't update register 0

[diminutivesloop]

Describe the bug
When yanking selected text in visual mode register 0 is not updated as it is when yanking text in normal mode.

To Reproduce
Steps to reproduce the behavior:

1. Enter visual mode via V.
2. Select a word via w.
3. Yank the selected word via y.
   => Register 0 does not contain the selected text

Expected behavior
Any time text is yanked the yanked text should be available in Register 0.

Environment (please complete the following information):

Extension version: 0.16.5
VS Code version: Code 1.27.2 (f46c4c469d6e6d8c46f268d1553c5dc4b475840f, 2018-09-12T16:17:45.060Z)
OS version: Windows_NT x64 6.1.7601

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4930MX CPU @ 3.00GHz (8 x 3192)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Memory (System)	31.94GB (15.56GB free)
Process Argv	C:\Users\npalmer\AppData\Local\Programs\Microsoft VS Code\Code.exe
Screen Reader	no
VM	0%

[jkillian]

Should be fixed by my PR #3087 once it is merged!