update readme [skip ci]

sp-nitech · Jul 11, 2023 · 9654e59 · 9654e59
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@@ -216,7 +216,7 @@ This software is released under the Apache License 2.0.
 
 Reference
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-```
+```bibtex
 @InProceedings{sp-nitech2023sptk,
   author = {Takenori Yoshimura and Takato Fujimoto and Keiichiro Oura and Keiichi Tokuda},
   title = {{SPTK4}: An open-source software toolkit for speech signal processing},