Fix icon for unofficially supported versions

Author: bkimminich

README.md

@@ -201,15 +201,15 @@ OWASP Juice Shop officially supports the following versions of
 [node.js LTS schedule](https://github.com/nodejs/LTS) as close as possible. Docker images and packaged distributions are
 offered accordingly.
 
-| node.js | Supported            | Tested                                                    | [Packaged Distributions](#packaged-distributions) | [Docker images](#docker-container) from `master` | [Docker images](#docker-container) from `develop` |
-|:--------|:---------------------|:----------------------------------------------------------|:--------------------------------------------------|:-------------------------------------------------|:--------------------------------------------------|
-| 22.x    | :x:                  | :x:                                                       |                                                   |                                                  |                                                   |
-| 21.x    | (:heavy_check_mark:) | :heavy_check_mark:                                        | Windows (`x64`), MacOS (`x64`), Linux (`x64`)     |                                                  |                                                   |
-| 20.x    | :heavy_check_mark:   | :heavy_check_mark:                                        | Windows (`x64`), MacOS (`x64`), Linux (`x64`)     | `latest` (`linux/amd64`, `linux/arm64`)          | `snapshot` (`linux/amd64`, `linux/arm64`)         |
-| 20.6.0  | :x:                  | :bug: https://github.com/angular/angular-cli/issues/25782 |                                                   |                                                  |                                                   |
-| 19.x    | (:heavy_check_mark:) | :x:                                                       |                                                   |                                                  |                                                   |
-| 18.x    | :heavy_check_mark:   | :heavy_check_mark:                                        | Windows (`x64`), MacOS (`x64`), Linux (`x64`)     |                                                  |                                                   |
-| <18.x   | :x:                  | :x:                                                       |                                                   |                                                  |                                                   |
+| node.js | Supported               | Tested                                                    | [Packaged Distributions](#packaged-distributions) | [Docker images](#docker-container) from `master` | [Docker images](#docker-container) from `develop` |
+|:--------|:------------------------|:----------------------------------------------------------|:--------------------------------------------------|:-------------------------------------------------|:--------------------------------------------------|
+| 22.x    | :x:                     | :x:                                                       |                                                   |                                                  |                                                   |
+| 21.x    | ( :heavy_check_mark:  ) | :heavy_check_mark:                                        | Windows (`x64`), MacOS (`x64`), Linux (`x64`)     |                                                  |                                                   |
+| 20.x    | :heavy_check_mark:      | :heavy_check_mark:                                        | Windows (`x64`), MacOS (`x64`), Linux (`x64`)     | `latest` (`linux/amd64`, `linux/arm64`)          | `snapshot` (`linux/amd64`, `linux/arm64`)         |
+| 20.6.0  | :x:                     | :bug: https://github.com/angular/angular-cli/issues/25782 |                                                   |                                                  |                                                   |
+| 19.x    | ( :heavy_check_mark: )  | :x:                                                       |                                                   |                                                  |                                                   |
+| 18.x    | :heavy_check_mark:      | :heavy_check_mark:                                        | Windows (`x64`), MacOS (`x64`), Linux (`x64`)     |                                                  |                                                   |
+| <18.x   | :x:                     | :x:                                                       |                                                   |                                                  |                                                   |
 
 Juice Shop is automatically tested _only on the latest `.x` minor version_ of each node.js version mentioned above!
 There is no guarantee that older minor node.js releases will always work with Juice Shop!