new icon: cassandra (original, original-wordmark, plain, plain-wordmark) (devicons#1558)

* Add Apache Cassandra

* Rename icons

Author: lunatic-fox

devicon.json

@@ -9630,6 +9630,31 @@
         "color": "#53B9FF",
         "aliases": []
     },
+    {
+        "name": "cassandra",
+        "altnames": [
+            "Apache Cassandra"
+        ],
+        "tags": [
+            "nosql",
+            "database",
+            "open-source"
+        ],
+        "versions": {
+            "svg": [
+                "original",
+                "original-wordmark",
+                "plain",
+                "plain-wordmark"
+            ],
+            "font": [
+                "plain",
+                "plain-wordmark"
+            ]
+        },
+        "color": "#1185b0",
+        "aliases": []
+    },
     {
         "name": "kibana",
         "altnames": [],