add developments to release v1.5.0

new reference return strategy to reduce communication amount in multiprocessing, /close #322 (closed) after test on HPC systems

docs/requirements_docs.txt

@@ -3,4 +3,5 @@ sphinx-autoapi==1.3.0
 sphinx-autodoc-typehints==1.10.3
 sphinx-rtd-theme==0.4.3
 #recommonmark==0.6.0
-m2r2==0.2.5
+m2r2==0.2.5
\ No newline at end of file
+docutils<0.18
\ No newline at end of file