Removed deprecation because AndroidSDK/API < 19

Author: litetex

extractor/src/main/java/org/schabi/newpipe/extractor/utils/Utils.java

@@ -13,10 +13,6 @@ public class Utils {
 
     public static final String HTTP = "http://";
     public static final String HTTPS = "https://";
-    /**
-     * @deprecated Use {@link java.nio.charset.StandardCharsets#UTF_8} instead
-     */
-    @Deprecated
     public static final String UTF_8 = "UTF-8";
     public static final String EMPTY_STRING = "";
     private static final Pattern M_PATTERN = Pattern.compile("(https?)?:\\/\\/m\\.");