chore: update library path

Author: Lennart Espe

README.md

@@ -5,8 +5,8 @@ A small math function collection based on the Taylor expansion series.
 - Download the source files from the `master`-tree
 - To build the project, you need to have `g++` and `make` installed
 - And you need to run `export CC=g++`
-- If everything is ready, run `make all` and ...
-- ... your `libtmath.a` library file is ready in the `build` folder
+- If everything is ready, run `make` and ...
+- ... your `libtmath.a` library file is ready in the `lib` folder
 
 ## How to use
 Just build it as described above, include the header files and link the library. The library uses the types `TMath::DOUBLE`(`long double`) and `TMath::LONG`(`long long`) for parameters and return values.