[BugFix] Point readme to updated dataset

[rahul-tuli]

The link mentioned previously downloaded a wrongly generated dataset (it had fewer inputs); the new link and the dataset have been verified to work with the readme command locally

#!/usr/bin/env bash

export CUDA_VISIBLE_DEVICES=2
export SPARSEZOO_TEST_MODE="true"
export NM_BIND_THREADS_TO_CORES=1
export NM_DISABLE_ANALYTICS=1
sparsify.login XXXXXXXXX
sparsify.run one-shot --use-case text_classification --model "zoo:nlp/sentiment_analysis/bert-base/pytorch/huggingface/sst2/base-none" --data /home/rahul/datasets/sst2_bert_calibration --optim-level 0.5