Update README.md

README.md

@@ -33,8 +33,9 @@ git clone https://gitlab.rrz.uni-hamburg.de/BAT9096/deepinverse.git
 
 # requirements
 install conda environment with python=3.6, 
-install astra-toolbox stable version(```conda install -c astra-toolbox astra-toolbox```)
+install astra-toolbox with stable version, pytorch, and dival.
 ```
+conda install -c astra-toolbox astra-toolbox
 conda install pytorch torchvision cudatoolkit=9.0 -c pytorch
 conda install dival
 ```