updated documentation links

Author: chakravala

README.md

@@ -16,9 +16,14 @@ In Reduce.jl, an upstream REDUCE package can be used with `load_package(::Symbol
 
 External packages provided by ReduceAlgebra.jl,
 - [Reduce.jl](https://github.com/chakravala/Reduce.jl): *core functionality (parser-generator)*, upstream docs ([REDUCE](http://www.reduce-algebra.com/manual/manual.html) / [pdf](http://www.reduce-algebra.com/manual/manual.pdf)), Julia docs ([stable](https://chakravala.github.io/Reduce.jl/stable) / [latest](https://chakravala.github.io/Reduce.jl/latest))
-- [ReduceLinAlg.jl](https://github.com/JuliaReducePkg/ReduceLinAlg.jl): *Linear algebra package*, upstream docs ([LINALG](http://www.reduce-algebra.com/manual/manualse127.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/linalg.pdf)), Julia docs (none yet)
+- [ReduceLinAlg.jl](https://github.com/JuliaReducePkg/ReduceLinAlg.jl): *Linear algebra package*, upstream docs ([LINALG](http://www.reduce-algebra.com/manual/manualse127.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/linalg.pdf)), Julia docs ([stable](https://JuliaReducePkg.github.io/ReduceLinAlg.jl/stable) / [latest](https://JuliaReducePkg.github.io/ReduceLinAlg.jl/latest))
 
-What is included with the Reduce.jl core package?
+What is included with the Reduce.jl core package? Julia docs ([stable](https://chakravala.github.io/Reduce.jl/stable/man/16-packages.html) / [latest](https://chakravala.github.io/Reduce.jl/latest/man/16-packages.html))
+- *Integration of square roots*, upstream docs ([ALGINT](http://www.reduce-algebra.com/manual/manualse91.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/algint.pdf))
+- *Package for compacting expressions*, upstream docs ([COMPACT](http://www.reduce-algebra.com/manual/manualse105.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/compact.pdf))
+- *A package for finding limits*, upstream docs ([LIMITS](http://www.reduce-algebra.com/manual/manualse126.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/limits.pdf))
 - *REDUCE LaTeX formula interface*, upstream docs ([RLFI](http://www.reduce-algebra.com/manual/manualse146.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/rlfi.pdf)), supports [IJulia.jl](https://github.com/JuliaLang/IJulia.jl) output
+- *REDUCE source code optimization package*, upstream docs ([SCOPE](http://www.reduce-algebra.com/manual/manualse150.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/scope.pdf))
+- *A package for series summation*, upstream docs ([SUM](http://www.reduce-algebra.com/manual/manualse157.html) / [pdf](http://www.reduce-algebra.com/manual/contributed/sum.pdf))
 
 More packages will be added. See [Implement External REDUCE Packages](https://github.com/orgs/JuliaReducePkg/projects/1) and [Implement Reduce](https://github.com/chakravala/Reduce.jl/projects/1) for progress.