add Crystal icon

[mamantoha]

Description

Add icon for the Crystal programming language (https://crystal-lang.org)

Requirements / Checklist

• Read the Contributing Guidelines
• Read or at least glanced at the FAQ
• Read or at least glanced at the Wiki
• Scripts execute without error (if necessary):
  • If any of the scripts were modified they have been tested and execute without error, e.g.:
    • ./font-patcher Inconsolata.otf --fontawesome --octicons --pomicons
    • ./gotta-patch-em-all-font-patcher\!.sh Hermit
• Extended the README and documentation if necessary, e.g. You added a new font please update the table

What does this Pull Request (PR) do?

Add icon for the Crystal programing language.

I used IcoMoon(https://icomoon.io/app) to convert the SVG file to the font and then converted it to OTF using FontForge. And add it to original-source.otf as e52f. Also, I update font-patcher to include new icon in patched fonts.

How should this be manually tested?

Screenshots

Changes in original-source.otf

Patched font:

Vim with patched font:

Let me know if I miss something.
Thanks!

[ryanoasis]

It looks good to me so far, you put the new glyph exactly where I would've expected to see it.

This will go in the next release, was right in the middle of trying to wrap up 2.1.0

I will pull your branch down and do some quick checking

[ryanoasis]

thanks. I think this is good to go for now!