add reference to tiagofumo/vim-nerdtree-syntax-highlight on readme

[tiagofumo]

Requirements (please check off with 'x')

• I have read the Contributing Guidelines
• I have read or at least glanced at the FAQ
• I have read or at least glanced at the Wiki

What does this Pull Request (PR) do?

adds reference to tiagofumo/vim-nerdtree-syntax-highlight on readme as talked with @ryanoasis on gitter

How should this be manually tested?

it's a readme file

Any background context you can provide?

I created this extension in another repo (because I thought I was going to be the only human being using it) and some people started caring about it, so I asked @ryanoasis if I should add reference to it on the readme's section and he said yes

What are the relevant tickets (if any)?

#158 (comment)

Screenshots (if appropriate or helpful)

it's possible to see the output on my fork's page: https://github.com/tiagofumo/vim-devicons

[ryanoasis]

@tiagofumo This was merged however the readme has changed drastically in v0.8.4 which part of those changes include offloading the FAQ to the wiki

Nevertheless I merged your change so you do get the credit and I replicated the same change you made to the wiki FAQ as well as mentioning the plugin in the changelog and release notes

[tiagofumo]

@ryanoasis thanks a lot man, I appreciate it 😃 . Sorry for the inconvenience.

[ryanoasis]

@tiagofumo no problem! No inconvenience at all no worries 😄