Workaround for broken version of dependency

Suddenly wrong binary for Pillow was being downloaded (though version seemed same)  and also older 1.0.34 of fastai was what was downloaded from fastai conda channel insread of 1.0.41. Installing fastai from pip seems to pull the right one and latest fastai lib.

Extensions/fastaiv1/fastaiWindows.ps1

@@ -1,6 +1,6 @@
 cmd.exe /c "activate root &  conda create -y -n fastai python=3.6 ipykernel"
-cmd.exe /c "activate fastai &  conda install -c pytorch pytorch torchvision -y"
+cmd.exe /c "activate fastai &  conda install -c pytorch pytorch -y"
-cmd.exe /c "activate fastai &  conda install -c fastai fastai -y"
+cmd.exe /c "activate fastai &  pip install fastai"
 function fixKernelSpec()  ##Fix the kernels name in course notebook to ensure right kernel is started
 {