PUZZLES.md page updated

PUZZLES.md

@@ -9,7 +9,7 @@ There are 1 active puzzles (10 total):
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<del>8-81cf3845</del> [`ReTable.java:101-102`](../master/src/main/java/com/jcabi/dynamo/retry/ReTable.java#L101-L102)<br/>
 &nbsp;&nbsp;&nbsp;&nbsp;[<del>10</del>](https://github.com/jcabi/jcabi-dynamo/issues/10) [`?`](../master/?)<br/>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<del>10-d74a245f</del> [`Throughput.java:76-76`](../master/src/main/java/com/jcabi/dynamo/Throughput.java#L76-L76)<br/>
-&nbsp;&nbsp;&nbsp;&nbsp;[#56](https://github.com/jcabi/jcabi-dynamo/issues/56):[<del>56</del>](https://github.com/jcabi/jcabi-dynamo/issues/56) [`?`](../master/?)<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;[<del>56</del>](https://github.com/jcabi/jcabi-dynamo/issues/56) [`?`](../master/?)<br/>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<del>56-be65f863</del> [`AwsIteratorITCase.java:51-53`](../master/src/test/java/com/jcabi/dynamo/AwsIteratorITCase.java#L51-L53)<br/>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<del>56-9ee1f8fe</del> [`RegionITCase.java:53-56`](../master/src/test/java/com/jcabi/dynamo/RegionITCase.java#L53-L56)<br/>
 &nbsp;&nbsp;&nbsp;&nbsp;[#75](https://github.com/jcabi/jcabi-dynamo/issues/75):[**10-41088ed2**](https://github.com/jcabi/jcabi-dynamo/issues/75) [`Throughput.java:72-74`](../master/src/main/java/com/jcabi/dynamo/Throughput.java#L72-L74)<br/>