editing base file of data group

2-Working-With-Data/README.md

@@ -4,10 +4,11 @@
 
 ### Topics
 
-1. [Spreadsheets](05-spreadsheets/README.md)
-2. [Relational Databases](06-relational-databases/README.md)
-3. [NoSQL](07-nosql/README.md)
-4. [Python](08-python/README.md)
-5. [Cleaning and Transformations](09-cleaning-transformations/README.md)
+1. [Relational databases](05-relational-databases/README.md)
+2. [Non-relational databases](06-non-relational/README.md)
+3. [Working with Python](07-python/README.md)
+4. [Preparing data](08-data-preparation/README.md)
 
 ### Credits
+
+These lessons were written with ❤️ by [Christopher Harrison](https://twitter.com/geektrainer) and ...