add cmap in datastructure
@@ -351,6 +351,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
* [bloom](https://github.com/zhenjl/bloom) - Bloom filters implemented in Go.
* [bloom](https://github.com/yourbasic/bloom) - Golang Bloom filter implementation.
* [boomfilters](https://github.com/tylertreat/BoomFilters) - Probabilistic data structures for processing continuous, unbounded streams.
+* [cmap](https://github.com/lrita/cmap) - a thread-safe concurrent map for go, support using `interface{}` as key and auto scale up shards.
* [concurrent-writer](https://github.com/free/concurrent-writer) - Highly concurrent drop-in replacement for `bufio.Writer`.
* [conjungo](https://github.com/InVisionApp/conjungo) - A small, powerful and flexible merge library.
* [count-min-log](https://github.com/seiflotfy/count-min-log) - Go implementation Count-Min-Log sketch: Approximately counting with approximate counters (Like Count-Min sketch but using less memory).
