improve release instructions

stevenbird · stevenbird · commit d3fde3a3b904 · 2024-08-17T15:13:44.000+09:30
diff --git a/RELEASE-HOWTO.txt b/RELEASE-HOWTO.txt
@@ -5,7 +5,7 @@ Building an NLTK distribution
    - py312-pytest py312-requests py312-sphinx
    - py312-numpy py312-matplotlib py312-tkinter
    - sqlite3-tcl
-   - pip install sphinxcontrib-apidoc twython build twine
+   - pip install sphinxcontrib-apidoc twython build twine pytest-mock
 
 1. Testing
    - Check no errors are reported in our continuous integration service:
