Rename environment definition file

Author: gjbex

source-code/interfaciing-c-c++-fortran/Pybind11/README.md

@@ -7,4 +7,4 @@ pybind11 is a wrapper generator for C++ code that has a lot of nice features.
 1. `Simple`: very simple illustration of wrapping C++ functions.
 1. `Spectrum`: illustration of warpping to support the buffer protocol.
 1. `Stats`: illustration of wrapping a C++ class.
-1. `pybind11.yml`: conda environment specification for this directory.
+1. `environment.yml`: conda environment specification for this directory.