Updating the sonarcloud syntax

Author: mccaffers

sonar-project.properties

@@ -1,8 +1,8 @@
 sonar.projectKey=mccaffers_backtesting-engine-cpp
 sonar.organization=mccaffers
 sonar.python.version=3.8
-sonar.language=c
-sonar.c.file.suffixes=.c,.h
-sonar.cpp.file.suffixes=.cc,.cpp,.cxx,.c++,.hh,.hpp,.hxx,.h++,.ipp
+sonar.language=cpp
+sonar.cpp.file.suffixes=.cpp,.hpp,.mm
 sonar.coverage.exclusions=tests/**, external/**/*, source/utilities/base64.cpp
 sonar.sources=source/
+sonar.tests=tests/