mardown rendering misalign

[rebornix]

Issue Type: Bug

On GitHub

Fixes #311 
![screen shot 2018-11-07 at 11 23 44 am](https://user-images.githubusercontent.com/3672607/48155338-a44c7c00-e27f-11e8-9b35-768fe51ce21b.png)

will be rendered as

<p>
	<span class="issue-keyword tooltipped tooltipped-se" aria-label="This pull request closes issue #311.">Fixes</span>
	<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="354907975"
	 data-permission-text="Issue title is private" data-hovercard-type="issue" data-hovercard-url="/Microsoft/vscode-pull-request-github/issues/311/hovercard"
	 href="https://github.com/Microsoft/vscode-pull-request-github/issues/311" aria-describedby="hovercard-aria-description"
	 aria-label="#311, Commits tree should show committer avatar">#311</a>
	<br>
	<a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/3672607/48155338-a44c7c00-e27f-11e8-9b35-768fe51ce21b.png"><img
		 src="https://user-images.githubusercontent.com/3672607/48155338-a44c7c00-e27f-11e8-9b35-768fe51ce21b.png" alt="screen shot 2018-11-07 at 11 23 44 am"
		 style="max-width:100%;"></a>
</p>

while in description page it's

<p>Fixes #311
<img src="https://user-images.githubusercontent.com/3672607/48155338-a44c7c00-e27f-11e8-9b35-768fe51ce21b.png" alt="screen shot 2018-11-07 at 11 23 44 am"></p>

Extension version: 0.2.3
VS Code version: Code - Insiders 1.29.0-insider (5438af145cf480ce0162bda0799435684b293ec5, 2018-11-07T00:54:27.213Z)
OS version: Darwin x64 18.0.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
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: enabled rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	3, 2, 2
Memory (System)	16.00GB (0.08GB free)
Process Argv	.
Screen Reader	no
VM	0%