SECURITY.md - use emoji in markdown table [ci skip]

GitHub uses a pre-processor for markdown, normal markdown processor don't handle emoji
puma · Sep 17, 2020 · 7d00e1d · 7d00e1d
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Showing 1 changed file with 5 additions and 5 deletions.
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 ## Supported Versions
 
-| Version | Supported          |
-| ------- | ------------------ |
-| Latest release in 5.x   | :white_check_mark: |
-| Latest release in 4.x  | :white_check_mark:                |
-| All other releases   | :x: |
+| Version       | Supported  |
+| :------------ | :--------: |
+| Latest release in 5.x | ✅ |
+| Latest release in 4.x | ✅ |
+| All other releases    | ❌ |
 
 ## Reporting a Vulnerability