script update + readme

src/matrix.rs

@@ -120,11 +120,11 @@ mod tests {
             int!(8),
             int!(12),
             int!(0),
-            int!(-5),
+            int!(5),
             int!(0),
             int!(0),
             int!(0),
-            int!(-5),
+            int!(5),
         ];
 
         let lattice = Matrix::new_lattice(noise_bits, ciphertexts).unwrap();