Fix linux category

GitSquared · GitSquared · commit b8e999445775 · 2017-10-13T18:25:40.000+02:00
diff --git a/package.json b/package.json
@@ -57,7 +57,7 @@
           "arch": ["x64", "ia32", "armv7l"]
         }
       ],
-      "category": "system",
+      "category": "System",
       "icon": "media/linuxIcons"
     },
     "win": {
