Compensate function use float data type

src/PMS/PMS5003.h

@@ -30,7 +30,7 @@ public:
   int getPm10Ae(void);
   int getPm03ParticleCount(void);
   int convertPm25ToUsAqi(int pm25);
-  int compensate(int pm25, float humidity);
+  float compensate(float pm25, float humidity);
   int getFirmwareVersion(void);
   uint8_t getErrorCode(void);
   bool connected(void);