MAINT: collab token update

* OPENBLAS_LIBS_STAGING_UPLOAD_TOKEN is now encrypted
directly in the appveyor UI at:
https://ci.appveyor.com/project/tylerjereddy/openblas-libs/settings/environment

* this approach is used instead of pasting an
encrypted env variable directly in the yml
file, which seems to have stricter requirements
in terms of ownership of the associated
GitHub project

Author: tylerjereddy

appveyor.yml

@@ -12,8 +12,8 @@ environment:
     # To generate a new token, we need the permissions:
     # - "Allow write access to the API site"
     # - "Allow uploads to PyPI repositories"
-    OPENBLAS_LIBS_STAGING_UPLOAD_TOKEN:
-      secure: CMOhqPqFG0CdbfKNhKW4IAVPRNiTU2QFxHazcIEG+OR3SR7tBL1/fIvpXiRar5Xj
+    # OPENBLAS_LIBS_STAGING_UPLOAD_TOKEN: this variable has been encrypted
+    # in the appveyor UI at: https://ci.appveyor.com/project/tylerjereddy/openblas-libs/settings/environment
     PYTHON: "C:\\Python37"
 
   # Need for mingw-builds discussed at