Added news item to 1.11.6 thanking rchk for finding the 7 memory faul…

…ts, #3033. This NEWS item is live on GitHub and will reflect on CRAN in the next release. Realized missing news item as a result of tweeting thanks: https://twitter.com/MattDowle/status/1042835186801471488
Rdatatable · Sep 20, 2018 · 76934d2 · 76934d2
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 12. The introduction of altrep in R 3.5.0 caused some performance regressions of about 20% in some cases, [#2962](https://github.com/Rdatatable/data.table/issues/2962). Investigating this led to some improvements to grouping which are faster than before R 3.5.0 in some cases. Thanks to Nikolay S. for reporting. The work to accomodate altrep is not complete but it is better and it is highly recommended to upgrade to this update.
 
+13. Fixed 7 memory faults thanks to CRAN's [`rchk`](https://github.com/kalibera/rchk) tool by Tomas Kalibera, [#3033](https://github.com/Rdatatable/data.table/pull/3033).
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 #### NOTES
 
 1. The type coercion warning message has been improved, [#2989](https://github.com/Rdatatable/data.table/pull/2989). Thanks to @sarahbeeysian on [Twitter](https://twitter.com/sarahbeeysian/status/1021359529789775872) for highlighting. For example, given the follow statements: