Release 1 new icon and 1 updated icon (v7.8.0)

# New Icons

- D (#7285)

# Updated Icons

- Mastodon (#7663)

_data/simple-icons.json

@@ -2565,6 +2565,11 @@
             "hex": "F7DF1E",
             "source": "https://github.com/cytoscape/cytoscape.js/blob/97c27700feefe2f7b79fca248763049e9a0b38c6/documentation/img/cytoscape-logo.svg"
         },
+        {
+            "title": "D",
+            "hex": "B03931",
+            "source": "https://github.com/dlang/dlang.org/blob/6d0e2e5f6a8249031cfd010e389b99ff014cd320/images/dlogo.svg"
+        },
         {
             "title": "D-EDGE",
             "hex": "432975",
@@ -6473,8 +6478,8 @@
         },
         {
             "title": "Mastodon",
-            "hex": "3088D4",
-            "source": "https://joinmastodon.org/"
+            "hex": "6364FF",
+            "source": "https://github.com/mastodon/mastodon/blob/7ccf7a73f1c47a8c03712c39f7c591e837cf6d08/app/javascript/images/logo-symbol-icon.svg"
         },
         {
             "title": "Material Design",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "simple-icons",
-  "version": "7.7.0",
+  "version": "7.8.0",
   "description": "SVG icons for popular brands https://simpleicons.org",
   "homepage": "https://simpleicons.org",
   "keywords": [

slugs.md

@@ -493,6 +493,7 @@ update the script at 'scripts/release/update-slugs-table.js'.
 | `Cycling '74` | `cycling74` |
 | `Cypress` | `cypress` |
 | `Cytoscape.js` | `cytoscapedotjs` |
+| `D` | `d` |
 | `D-EDGE` | `dedge` |
 | `D-Wave Systems` | `dwavesystems` |
 | `D3.js` | `d3dotjs` |