Update data_cleaning tutorial with Python code and updated Pandas information

Author: erikaduan

README.md

@@ -31,8 +31,8 @@ Many kudos to [Dr Chuanxin Liu](https://github.com/codetrainee), my former PhD s
 
 ## 📚 Data cleaning
 
-+ [Data cleaning using `data.table` or `tidyverse` (or Python `Pandas`)](https://github.com/erikaduan/r_tips/blob/master/tutorials/dc-data_table_vs_dplyr/dc-data_table_vs_dplyr.md) (Updated)   
-+ [Manipulating character strings using regular expressions](https://github.com/erikaduan/r_tips/blob/master/tutorials/dc-cleaning_strings/dc-cleaning_strings.md)   
++ [Data cleaning using `data.table` or `tidyverse` (or Python `Pandas`)](https://github.com/erikaduan/r_tips/blob/master/tutorials/dc-data_table_vs_dplyr/dc-data_table_vs_dplyr.md) (Updated)    
++ [Manipulating character strings using regular expressions](https://github.com/erikaduan/r_tips/blob/master/tutorials/dc-cleaning_strings/dc-cleaning_strings.md) (Updated)          
 
 ## 🔨 Productionisation  
 + [Creating SQL <> R workflows - Part 1](https://github.com/erikaduan/r_tips/blob/master/tutorials/p-sql_to_r_workflows/p-sql_to_r_workflows_part_1.md) (Updated)