Rename PRNG.h to prng.h

Author: DedeHai

wled00/PRNG.h renamed to wled00/prng.h

@@ -21,4 +21,4 @@ class PRNG {
   uint8_t random8() { return random16() >> 8; }
   uint8_t random8(uint8_t lim) { return (uint8_t)(((uint16_t)random8() * lim) >> 8); }
   uint8_t random8(uint8_t min, uint8_t lim) { uint8_t delta = lim - min; return random8(delta) + min; }
-};
+};