Update: The credit was restored in the budget that was approved on Feb 8, 2018, retroactive for the 2017 tax year. It will probably take 2-4 weeks (or longer) for the IRS to update their computer systems to accept tax returns with this credit, and then for the IRS to approve tax software providers to update their systems. You can file now, and then file an amended return later to claim the credit, or you can wait until everyone catches up and the credit appears in the program.
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No, it expired at the end of 2016.
There is a possibility that it will be renewed but that hasn't happened yet.
