Fix MIME type

Author: Yukaii

mode/csv/index.html

@@ -43,6 +43,6 @@ <h2>CSV mode</h2>
         Simple mode that handles CSV language.
     </p>
 
-    <p><strong>MIME type defined:</strong> <code>text/csv</code>
+    <p><strong>MIME type defined:</strong> <code>text/x-csv</code>
     (CSV)
 </article>

mode/meta.js

@@ -31,7 +31,7 @@
     {name: "Cython", mime: "text/x-cython", mode: "python", ext: ["pyx", "pxd", "pxi"]},
     {name: "Crystal", mime: "text/x-crystal", mode: "crystal", ext: ["cr"]},
     {name: "CSS", mime: "text/css", mode: "css", ext: ["css"]},
-    {name: "CSV", mime: "text/csv", mode: "csv", ext: ["csv"]},
+    {name: "CSV", mime: "text/x-csv", mode: "csv", ext: ["csv"]},
     {name: "CQL", mime: "text/x-cassandra", mode: "sql", ext: ["cql"]},
     {name: "D", mime: "text/x-d", mode: "d", ext: ["d"]},
     {name: "Dart", mimes: ["application/dart", "text/x-dart"], mode: "dart", ext: ["dart"]},