README.md / explicitly say python3 instead of python

Author: Arxcis

README.md

@@ -7,7 +7,7 @@ Welcome to this community project, where we collaboratively solve the 2020 editi
 
 | Language  | Total  | 01   |  02 |  03 |  04 |  05 | 06  | 07 | 08 | 09 | 10 |11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|
 |-----------|--------|------|-----|-----|-----|-----|---- |----|----|----|----|-|-|-|-|-|-|-|-|-|-|-|-|-|-|-|
-| python    | **17** |  2   |  1  |  3  |  4  |  4  |  3  |    |    |    |    ||||||||||||||||
+| python3   | **17** |  2   |  1  |  3  |  4  |  4  |  3  |    |    |    |    ||||||||||||||||
 | golang    | **11** |  2   |  2  |  2  |  1  |  2  |  2  |    |    |    |    ||||||||||||||||
 | c         |  **6** |  1   |  1  |  1  |  1  |  1  |  1  |    |    |    |    ||||||||||||||||
 | sml       |  **6** |  1   |  1  |  1  |  1  |  1  |  1  |    |    |    |    ||||||||||||||||