Update README.md

Author: ashki23

README.md

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 This is a general repository about Python programming. You may find notes about virtual environments, packge managers and 
 introduction of programming in Python. The following is list of content of the repository:
-- [Function programming in Python](https://github.com/ashki23/Python-notes/blob/master/Function_programming.md)
-- [Python data structures](https://github.com/ashki23/Python-notes/blob/master/Data_structure.md)
-- [Virtual Environments in Python](https://github.com/ashki23/Python-notes/blob/master/Virtual_environments.md)
-- [Lambda function](https://github.com/ashki23/Python-notes/blob/master/Lambda.md)
-- [String formatting or interpolation operator](https://github.com/ashki23/Python-notes/blob/master/Magic_string.md)
-- [Regular expression](https://github.com/ashki23/Python-notes/blob/master/Regular_expression.md)
-- [Complex numbers](https://github.com/ashki23/Python-notes/blob/master/Complex_numbers.md)
+- [Function programming in Python](https://github.com/ashki23/Python-notes/blob/master/python-fun.md)
+- [Python data structures](https://github.com/ashki23/Python-notes/blob/master/python-str.md)
+- [Virtual Environments in Python](https://github.com/ashki23/Python-notes/blob/master/python-env.md)
+- [Lambda function](https://github.com/ashki23/Python-notes/blob/master/lambda.md)
+- [String formatting or interpolation operator](https://github.com/ashki23/Python-notes/blob/master/magic-string.md)
+- [Regular expression](https://github.com/ashki23/Python-notes/blob/master/regular-expression.md)
+- [Complex numbers](https://github.com/ashki23/Python-notes/blob/master/complex-numbers.md)
 
 ---
 Copyright 2018-2019, [Ashkan Mirzaee](https://ashki23.github.io/index.html) | Content is available under [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/) | Sourcecode licensed under [GPL-3.0](https://www.gnu.org/licenses/gpl-3.0.en.html)