message: added txt mimetype.
diff: @@ -30,7 +30,7 @@ char* swoole_get_mimetype(char *file)
  {
  return "text/html";
  }
  - else if (strcasecmp(dot, ".xml") == 0 || strcasecmp(dot, ".htm") == 0)
  + else if (strcasecmp(dot, ".xml") == 0)
  {
  return "text/xml";
  }
  @@ -38,7 +38,7 @@ char* swoole_get_mimetype(char *file)
  {
  return "text/css";
  }
  - else if (strcasecmp(dot, ".text") == 0)
  + else if (strcasecmp(dot, ".text") == 0 || strcasecmp(dot, ".txt") == 0)
  {
  return "text/plain";
  }
  