Merge pull request #1157 from sjsrey/master

DOC: update build instructions

tools/README.md

@@ -1,6 +1,12 @@
 # Tooling to Build PySAL Meta Package
 
+## Dependencies
+
+- [yolk3k](https://pypi.org/project/yolk3k/)
+
+## Instructions
+
 - build.py
   - creates a requirements.txt file in this dir that can be hand edited if needed before moving up to `pysal/requirements.txt`
-  - creates `pysal/pysal/base.py` with information for pinning to subpackage versions
+  - creates `pysal/pysal/frozen.py` with information for pinning to subpackage versions
 - gitcount-tables.ipynb (WIP): builds changelog for meta package