[print-util] Add api.py to install-line of manual install in README.md

README.md

@@ -41,7 +41,7 @@ mkdir -p /usr/lib/spotirec
 mkdir -p /usr/bin
 mkdir -p $HOME/.config/spotirec
 
-install spotirec.py oauth2.py recommendation.py -t /usr/lib/spotirec
+install spotirec.py oauth2.py recommendation.py api.py -t /usr/lib/spotirec
 
 ln -s /usr/lib/spotirec/spotirec.py /usr/bin/spotirec
 ```
@@ -158,4 +158,4 @@ $ spotirec --print genre-seeds
 ```
 
 ## Troubleshooting
-If you encounter issues adding tracks to your playlist, try running the script from a terminal. This should output a status code of the request, as well as some information about the code. Should you need additional help regarding status codes, consult the table in the `Response Status Codes` section [here](https://developer.spotify.com/documentation/web-api/)
+If you encounter issues adding tracks to your playlist, try running the script from a terminal. This should output a status code of the request, as well as some information about the code. Should you need additional help regarding status codes, consult the table in the `Response Status Codes` section [here](https://developer.spotify.com/documentation/web-api/)