Merge pull request #6 from jatyPeng/patch-1

imagesetpixel需要传int类型参数，现在传的是浮点。代码会报错。

Author: kiss291323003

src/VerifyCode.php

@@ -142,10 +142,10 @@ private function writeCurve(): void
                 $py = $A * sin($w * $px + $f) + $b + $this->conf->imageH / 2; // y = Asin(ωx+φ) + b
                 $i = (int)($this->conf->fontSize / 5);
                 while ($i > 0) {
-                    imagesetpixel($this->imInstance, $px + $i, $py + $i, $this->conf->fontColor);
+                    imagesetpixel($this->imInstance, intval($px + $i), intval($py + $i), $this->conf->fontColor);
                     $i--;
                 }
             }
         }
     }
-}
+}