Fix pointless type mismatch between StringRef and std::string

include/internal/catch_assertionresult.cpp

@@ -91,7 +91,7 @@ namespace Catch {
         return m_info.lineInfo;
     }
 
-    std::string AssertionResult::getTestMacroName() const {
+    StringRef AssertionResult::getTestMacroName() const {
         return m_info.macroName;
     }
 

include/internal/catch_assertionresult.h

@@ -47,7 +47,7 @@ namespace Catch {
         std::string getExpandedExpression() const;
         std::string getMessage() const;
         SourceLineInfo getSourceInfo() const;
-        std::string getTestMacroName() const;
+        StringRef getTestMacroName() const;
 
     //protected:
         AssertionInfo m_info;