update install instructions

Author: JohnMount

README.txt

@@ -1,11 +1,7 @@
-Win Vector LLC tools for teaching data science in Python 3
-
-# ~/anaconda3/bin/python3 setup.py sdist
-
-~/anaconda3/bin/pip uninstall wvpy
-~/anaconda3/bin/pip install https://github.com/WinVector/wvpy/raw/master/dist/wvpy-0.1.tar.gz
-# (any dependencies warned about abort install)
+Win Vector LLC extras for teaching data science in Python 3
 
+pip install wvpy
+# or: pip install https://github.com/WinVector/wvpy/raw/master/dist/wvpy-0.1.1.tar.gz
 
 ~/anaconda3/bin/python3