add record stats to cache

src/main/java/com/danielbohry/stocks/config/CacheConfig.java

@@ -44,6 +44,7 @@ public class CacheConfig {
         return new CaffeineCache(name, newBuilder()
                 .expireAfterWrite(duration)
                 .maximumSize(size)
+                .recordStats()
                 .build());
     }