Updated CHANGELOG

CHANGELOG.md

 Change Log
 ==========
 
+v5.0.0 (2021/05/XX)
+-------------------
+
+- Update the initialization for Forpy, such that in case of a module import error, the code has a better chance to print a clear error message.
+- Fix an undefined variable in `Tools/set_npwq.f90`. Add `IMPLICIT NONE to all program units to let the compiler catch such errors in the future.
+- Avoid overflow in `Wstat/wstat_memory_report.f90` in large-scale runs.
+- Fix non-standard Fortran codes that do not work with NVIDIA/PGI Fortran compiler.
+- Fix file mode for source files in Westpp. All files were executable before.
+- Work around an input parsing issue encountered with pgfortran and nvfortran.
+- Update build instructions for ALCF/Theta, NERSC/Cori, UChicago/RCC/Midway3, macOS 
+- Updated documentation
+
 v4.2.1 (2020/10/19)
 -------------------
 

VERSION.json

 {
 "name" : "WEST",
-"version" : "4.2.1",
+"version" : "pre-5.0.0",
 "url" : "http://west-code.org",
 "license" : "GPLv3"
 }