new icon: AArch64 (original, plain) (#507)

Author: amacado

devicon.json

@@ -64,6 +64,26 @@
         "color": "#A4C439",
         "aliases": []
     },
+    {
+        "name": "aarch64",
+        "tags": [
+            "architecture",
+            "programming",
+            "language",
+            "ARM"
+        ],
+        "versions": {
+            "svg": [
+                "original",
+                "plain"
+            ],
+            "font": [
+                "plain"
+            ]
+        },
+        "color": "#16358C",
+        "aliases": []
+    },
     {
         "name": "angularjs",
         "tags": [