Update README.md

Author: SergeStinckwich

README.md

@@ -39,7 +39,7 @@ Metacello new
         load
 ```
 
-We have **872** green tests ! At the moment, all the development happens in the master branch (we are using [trunk-based development](https://trunkbaseddevelopment.com/)).
+We have **900** green tests ! At the moment, all the development happens in the master branch (we are using [trunk-based development](https://trunkbaseddevelopment.com/)).
 
 PolyMath is a Pharo project, similar to existing scientific libraries like NumPy, SciPy for Python or SciRuby for Ruby. PolyMath already provides the following basic functionalities:
 - complex and quaternions extensions,