Drop install-dependencies script.

- Do a standard install with pip.
- Run install-tools afterwards.
- util-linux was needed for what?

README.md

@@ -10,8 +10,8 @@ Eris maintains an up-to-date set of reports for every file in a codebase.
 
     # git clone https://github.com/ahamilton/eris
     # cd eris
-    # ./install-dependencies
-    # python3.9 -m pip install .
+    # python3.9 -m pip install -r requirements.txt .
+    # ./install-tools
     # eris -h
 
 ### Docker