README update

Author: henricasanova

README.md

@@ -14,8 +14,7 @@ Provide a Python API for [WRENCH](https://wrench-project.org). This API is built
 
   - [WRENCH](https://github.com/wrench-project/wrench) and its dependencies
     - You must compile the `wrench-daemon` target (i.e., `make wrench-daemon`) during the build process before doing the usual (`sudo make install`)
-
-  - Run `python3 -m build` to build the package.
+  - Run `python3 -m build` to build the package (you may need to install the `build` Python package).
   - Run `python3 -m pip install ./dist/wrench-*.whl` to install the package
 
 # Examples and API Documentation