Merge pull request #120 from skynetcap/feature/design-fix

Set `ads.txt` content type to `text/plain`

src/main/java/com/mmorrell/serumdata/controller/IndexController.java

@@ -143,7 +143,7 @@ public String market(Model model, @PathVariable String market) {
     }
 
     // Required by adsense
-    @RequestMapping("/ads.txt")
+    @RequestMapping(value = "/ads.txt", produces = "text/plain")
     @ResponseBody
     public String adsTxt() {
         return "google.com, pub-5953035831251215, DIRECT, f08c47fec0942fa0";