vactivate spawns a shell in a subprocess for easier exiting, and prompt customization

.bashrc

@@ -178,5 +178,5 @@ vactivate() {
 	if [[ ! -d $path ]]; then
 		python -m venv $path --prompt "venv: $1"
 	fi
-	source $path/bin/activate
+	source $path/bin/activate; bash; deactivate
 }