new icon: knockout (plain-wordmark) (#628)

* Added Knockout icon (plain workmark only)

* Updated devicon.json

Co-authored-by: Adriano Ueda <adriano.ueda@gmail.com>
Co-authored-by: Clemens Bastian <8781699+amacado@users.noreply.github.com>

Author: 3 people

devicon.json

@@ -2015,6 +2015,23 @@
         "color": "#7C6DB2",
         "aliases": []
     },
+    {
+        "name": "knockout",
+        "tags": [
+            "framework",
+            "javascript"
+        ],
+        "versions": {
+            "svg": [
+                "plain-wordmark"
+            ],
+            "font": [
+                "plain-wordmark"
+            ]
+        },
+        "color": "#e42e16",
+        "aliases": []
+    },
     {
         "name": "krakenjs",
         "tags": [