Update README.md

Author: qingsongedu

README.md

@@ -1,7 +1,7 @@
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   <!-- <h1><b> Time-LLM </b></h1> -->
   <!-- <h2><b> Time-LLM </b></h2> -->
-  <h2><b> Time-LLM: Time Series Forecasting by Reprogramming Large Language Models </b></h2>
+  <h2><b> (ICLR'24) Time-LLM: Time Series Forecasting by Reprogramming Large Language Models </b></h2>
 </div>
 
 <div align="center">