Change naming convention of class properties

src/core/include/ConfigManager.hpp

@@ -16,8 +16,8 @@ class ConfigManager
     ConfigManager(Logger& logger, vector<string>& parameters);
 
     private:
-    Logger& logger_;
-    const vector<string>& parameters_;
+    Logger& _logger;
+    const vector<string>& _parameters;
 };
 
 }}