updating installation instructions

doc/install.md

@@ -17,7 +17,7 @@ WRENCH is developed in `C++`. The code follows the C++11 standard, and thus olde
 compilers may fail to compile it. Therefore, we strongly recommend
 users to satisfy the following requirements:
 
-- **CMake** - version 3.2.3 or higher
+- **CMake** - version 3.5 or higher
 
 And, one of the following:
 - <b>g++</b> - version 5.0 or higher
@@ -26,7 +26,7 @@ And, one of the following:
 
 ## Required Dependencies ##                  {#install-prerequisites-dependencies}
 
-- [SimGrid](https://simgrid.org/) -- version 3.21
+- [SimGrid](https://simgrid.org/) -- version 3.25
 - [Lemon C++ library](http://lemon.cs.elte.hu/) -- version 1.3.1 or higher 
 - [PugiXML](http://pugixml.org/) -- version 1.8 or higher 
 - [JSON for Modern C++](https://github.com/nlohmann/json) -- version 2.1.1 or higher