Update readme

README.md

@@ -42,7 +42,7 @@ pip install astrotools --user
 ```
 
 If you like to have the latest version (which is not an official release version), you can clone
-the astrotools in a local folder and install it via pip from there:
+the astrotools repository in a local folder and install it via pip from there:
 ```bash
 git clone https://git.rwth-aachen.de/astro/astrotools.git
 cd astrotools