Add endline caracter in header

src/filewriter.h

@@ -139,7 +139,7 @@ public:
 
 class IMUFileWriter: public FileWriter {
     // const std::string header = "Timestamp,ax,ay,az,gx,gy,gz,mx,my,mz\n";
-    const std::string header = "Sensor Type,TimeStamp(ms) or Time, val0,val1,val2,val3,val4,val5,val6,val7";
+    const std::string header = "Sensor Type,TimeStamp(ms) or Time, val0,val1,val2,val3,val4,val5,val6,val7\n";
     const size_t frame_size = 32;
     const size_t additional_data_size = 736;
 private: