fix: Update credential file path check to current working directory

Author: rmkeezer

README.md

@@ -8,7 +8,7 @@ This project contains the core functionality used by Python SDK's generated by t
 Python code generated by openapi-sdkgen will depend on the function contained in this project.
 
 # Notice
-Support for Python versions 2.x and versions <= 3.4 is deprecated and will be officially dropped in the next major release, which is expected to be end of September, 2019.
+Support for Python versions 2.x and versions <= 3.4 is deprecated and will be officially dropped in the next major release, which is expected to be end of December, 2019.
 
 ## Installation