Make port configurable about vim-instant-markdown

[iwyg]

+1 I second that :)

Seems, the port is hardcoded into the plugin?

[andradei]

👍 All the way, since I have a project which uses 8090. For now I'm going to modify the plugin to use a less common port.

Edit: I tried changing the port in the plugin, but that didn't make a difference, it still used localhost:8090. So the actual port is chosen from the npm package instant-markdown-d which this plugin is dependent on.

[stale]

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