[-] return updated python and pip variables from install-env.bat

Author: pashagolub

install-env.bat

@@ -22,4 +22,6 @@ echo Python version is:
 %PYTHON% --version
 
 echo PIP version is:
-%PIP% --version
+%PIP% --version
+
+endlocal && set PYTHON=%PYTHON% && set PIP=%PIP%