Update version on the Sonar configuration file

sonar-project.properties

 # Required metadata
 sonar.projectKey=glances
 sonar.projectName=Glances
-sonar.projectVersion=2.4_beta
- 
+sonar.projectVersion=2.5
+
 # Path to the parent source code directory.
 # Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
-# Since SonarQube 4.2, this property is optional if sonar.modules is set. 
-# If not set, SonarQube starts looking for source code from the directory containing 
+# Since SonarQube 4.2, this property is optional if sonar.modules is set.
+# If not set, SonarQube starts looking for source code from the directory containing
 # the sonar-project.properties file.
 sonar.sources=glances
 
@@ -15,6 +15,6 @@ sonar.language=py
 
 # Encoding of the source code
 sonar.sourceEncoding=UTF-8
- 
+
 # Additional parameters
 #sonar.my.property=value