Update requirements.txt

requirements.txt

@@ -1,7 +1,7 @@
 # those requirements are only for separating tracks with pre-trained model.
 # If you require training or model evaluation, please look at the conda environment
 # files, environmnent-cpu.yml and environment-cuda.yml
-diffq>=0.1
+diffq<0.2.0
 lameenc>=1.2
 julius>=0.2.3
 numpy