DATAREDIS-424 - Update Reference Documentation.

Updated what’s new section in reference documentation.
Remove outdated version from readme.
Update project team twitter handle on readme.

src/asciidoc/new-features.adoc

@@ -1,6 +1,15 @@
 [[new-features]]
 = New Features
 
+[[new-in-1-6-0]]
+== New in Spring Data Redis 1.6 
+
+* The `Lettuce` Redis driver switched from https://github.com/wg/lettuce[wg/lettuce] to https://github.com/mp911de/lettuce[mp911de/lettuce].
+* Support for `ZRANGEBYLEX`.
+* Enhanced range operations for `ZSET`s including `+inf` / `-inf`.
+* Performance improvements in `RedisCache` now releasing connections earlier.
+* Generic Jackson2 `RedisSerializer` making use of Jackson's polymorphic deserialization.
+
 [[new-in-1-5-0]]
 == New in Spring Data Redis 1.5