Merge pull request #96 from Kha/master

fix requirements.nix

requirements.nix

@@ -19,20 +19,6 @@ let
     inherit pkgs;
     inherit (pkgs) stdenv;
     python = pkgs.python3;
-    # patching pip so it does not try to remove files when running nix-shell
-    overrides =
-      self: super: {
-        bootstrapped-pip = super.bootstrapped-pip.overrideDerivation (old: {
-          patchPhase = old.patchPhase + ''
-            if [ -e $out/${pkgs.python3.sitePackages}/pip/req/req_install.py ]; then
-              sed -i \
-                -e "s|paths_to_remove.remove(auto_confirm)|#paths_to_remove.remove(auto_confirm)|"  \
-                -e "s|self.uninstalled = paths_to_remove|#self.uninstalled = paths_to_remove|"  \
-                $out/${pkgs.python3.sitePackages}/pip/req/req_install.py
-            fi
-          '';
-        });
-      };
   };
 
   commonBuildInputs = [];
@@ -191,4 +177,4 @@ in python.withPackages
             generated
             allOverrides
          )
-   )
+   )