Bump to 0.23.2 and update README.md

Signed-off-by: Florian Dupuy <florian.dupuy@rte-france.com>

Author: flo-dup

README.md

@@ -113,7 +113,7 @@ After adding a last Maven dependency on Open Load Flow implementation:
 <dependency>
     <groupId>com.powsybl</groupId>
     <artifactId>powsybl-open-loadflow</artifactId>
-    <version>0.23.1</version>
+    <version>0.23.2</version>
 </dependency>
 ```
 

pom.xml

@@ -20,7 +20,7 @@
     </parent>
 
     <artifactId>powsybl-open-loadflow</artifactId>
-    <version>0.23.1</version>
+    <version>0.23.2</version>
 
     <name>powsybl open loadflow</name>
     <description>An open source loadflow based on PowSyBl</description>