~= improved Pipfile

Pipfile

@@ -6,15 +6,12 @@ verify_ssl = true
 [dev-packages]
 
 [packages]
-Cython = "*"
-jupyter = "*"
-numpy = "*"
-pandas = "*"
-matplotlib = "*"
-ruamel-yaml = "*"
-scikit-learn = "*"
-graphviz = "*"
-prrt = {editable = true, path = "."}
-
-[requires]
-python_version = "3.6"
+cython       = "==0.29.13"
+jupyter      = "==1.0.0"
+numpy        = "==1.17.0"
+pandas       = "==0.25.1"
+matplotlib   = "==3.1.1"
+ruamel-yaml  = "==0.16.5"
+scikit-learn = "==0.21.3"
+graphviz     = "==0.12"
+prrtpy       = {editable = true, path = "./"}

requirements.txt

-cython==0.28.3
\ No newline at end of file