Fixed typo (#117)

Updated the size value data presentation in README.md from 12GB to
1.2GB. This correction was essential to present the accurate
information, which in turn leads to correct test results and performance
evaluations.

README.md

@@ -1151,7 +1151,7 @@ id,bool_int,bool_str,number,float,date,datetime,domain,email,ip4
 
 
 <details>
-  <summary>Columns: 20, Size: 12 GB</summary>
+  <summary>Columns: 20, Size: 1.2 GB</summary>
 
 ```csv
 id,bool_int,bool_str,number,float,date,datetime,domain,email,ip4,uuid,address,postcode,latitude,longitude,ip6,sentence_tiny,sentence_small,sentence_medium,sentence_huge