Update README.md

Signed-off-by: Fabiana 🚀  Campanari <113218619+FabianaCampanari@users.noreply.github.com>

Author: FabianaCampanari

README.md

@@ -568,6 +568,7 @@ $$
 \begin{aligned}
 \textbf{Max.} \quad & Z = 4x_1 + 3x_2 \\
 \textbf{S.a.} \quad &
+
 \begin{cases}
 x_1 + 3x_2 \leq 7 \\
 2x_1 + 2x_2 \leq 8 \\
@@ -591,6 +592,7 @@ $$
 \begin{aligned}
 \text{Max.} \quad & Z = 4x_1 + 3x_2 \\
 \text{S.a.} \quad & 
+
 \begin{cases}
 x_1 + 3x_2 \leq 7 \\
 2x_1 + 2x_2 \leq 8 \\