Mention Base.@kwdef updates in README. Small docs update.

Author: mauro3

README.md

@@ -108,6 +108,10 @@ Documentation is here: [stable](https://mauro3.github.io/Parameters.jl/stable) a
 
 # Related packages
 
+- `Base.@kwdef` has functionality similar to `@with_kw` but more
+  limited.  However, with Julia v1.1 its capabilities will be much
+  enhanced, see [#29316](https://github.com/JuliaLang/julia/pull/29316).
+  If that is enough, ditch the Parameters.jl dependency.
 - [QuickTypes.jl](https://github.com/cstjean/QuickTypes.jl) also
   provides key-word constructors and default values.  Provides a more
   compact format.  I'd say QuickTypes.jl is more suited for REPL and

docs/src/index.md

@@ -1,7 +1,5 @@
 # [Parameters.jl](https://github.com/mauro3/Parameters.jl)
 
-**Breaking news: Julia 0.5 support dropped.**
-
 This is a package I use to handle numerical-model parameters, thus the
 name.  However, it should be useful otherwise too.  It has two main
 features: