remobe draw_tree force install which didn't work as expected

Author: edwardchalstrey1

.readthedocs.yml

@@ -13,9 +13,6 @@ build:
     - libgmp-dev
     - pandoc
     - texlive-full
-  jobs:
-    pre_install:
-      - pip install --upgrade --force-reinstall "draw_tree @ git+https://github.com/gambitproject/draw_tree.git@main#egg=draw_tree"
 
 python:
   install:

doc/requirements.txt

@@ -10,4 +10,4 @@ matplotlib
 pickleshare
 jupyter
 open_spiel; sys_platform != 'win32'
-draw_tree @ git+https://github.com/gambitproject/draw_tree.git@main#egg=draw_tree
+draw-tree @ git+https://github.com/gambitproject/draw_tree.git@main;