Remove reference to MPS (#216)

*Issue #, if available:*

*Description of changes:* MPS mostly causes issues for users, so let's
remove the reference to MPS from the README. Plus, Chronos-Bolt models
currently fail on MPS.


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Co-authored-by: Abdul Fatir Ansari <[email protected]>

Author: abdulfatir

README.md

@@ -104,7 +104,7 @@ from chronos import BaseChronosPipeline
 
 pipeline = BaseChronosPipeline.from_pretrained(
     "amazon/chronos-t5-small",  # use "amazon/chronos-bolt-small" for the corresponding Chronos-Bolt model
-    device_map="cuda",  # use "cpu" for CPU inference and "mps" for Apple Silicon
+    device_map="cuda",  # use "cpu" for CPU inference
     torch_dtype=torch.bfloat16,
 )