Minor update to README.md [ci skip]

README.md

@@ -39,18 +39,14 @@ ArXiv version:
 
 **New:** Preliminary/experimental Python wrapper for Imfit: [PyImfit](https://github.com/perwin/pyimfit)
 
+** NOTE:** The previous version of Imfit (1.7.0) had an error in the build process
+which removed OpenMP-based speedups. Please upgrade to version 1.7.1, which fixes
+the problem and restores Imfit's proper speed!
 
-DOI for current release (v1.7), archived at Zenodo:
+DOI for current release (v1.7.1), archived at Zenodo:
 
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.594956.svg)](https://doi.org/10.5281/zenodo.594956)
 
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 Astronomy Source Code Library entry: