v0.49.0.
Better docs for SCAN SSCAN HSCAN ZSCAN iterators.
Added test for SSCAN iterator test with new 'iterate' argument for the
callback (Special Thanks to @FGRibreau).
Modified and corrected iterators examples and tests.
On branch master
modified:   Readme.md
modified:   example/iterator-hscan-example.js
modified:   example/iterator-scan-example.js
modified:   example/iterator-sscan-example.js
modified:   package.json
modified:   test/iterator-scan-test.js
new file:   test/iterator-sscan-test.js