fix readme silu

PanZezhong1725 · PanZezhong1725 · commit 3166e0f6e5ce · 2024-08-02T15:11:59.000+08:00
diff --git a/README.md b/README.md
@@ -30,6 +30,7 @@ $$
 $$
 silu(x) = sigmoid(x) × x
 $$
+
 $$
 sigmoid(x) = \frac{1}{1 + e^{-x}}
 $$
