add disksing/iter (#2852)

README.md

@@ -355,6 +355,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 * [hide](https://github.com/emvi/hide) - ID type with marshalling to/from hash to prevent sending IDs to clients.
 * [hilbert](https://github.com/google/hilbert) - Go package for mapping values to and from space-filling curves, such as Hilbert and Peano curves.
 * [hyperloglog](https://github.com/axiomhq/hyperloglog) - HyperLogLog implementation with Sparse, LogLog-Beta bias correction and TailCut space reduction.
+* [iter](https://github.com/disksing/iter) - Go implementation of C++ STL iterators and algorithms.
 * [levenshtein](https://github.com/agext/levenshtein) - Levenshtein distance and similarity metrics with customizable edit costs and Winkler-like bonus for common prefix.
 * [levenshtein](https://github.com/agnivade/levenshtein) - Implementation to calculate levenshtein distance in Go.
 * [mafsa](https://github.com/smartystreets/mafsa) - MA-FSA implementation with Minimal Perfect Hashing.