Fix README formatting error

README.md

@@ -211,7 +211,7 @@ Please read `GotoBLAS_01Readme.txt` for older CPU models already supported by th
 - **ZVL???B**: Level-3 BLAS and Level-1,2 including vectorised kernels targeting generic RISCV cores with vector support with registers of at least the corresponding width; ZVL128B and ZVL256B are available.
 e.g.:
   ```sh
-make TARGET=RISCV64_ZVL256B CFLAGS="-DTARGET=RISCV64_ZVL256B" \
+    make TARGET=RISCV64_ZVL256B CFLAGS="-DTARGET=RISCV64_ZVL256B" \
     BINARY=64 ARCH=riscv64 CC='clang -target riscv64-unknown-linux-gnu' \
     AR=riscv64-unknown-linux-gnu-ar AS=riscv64-unknown-linux-gnu-gcc \
     LD=riscv64-unknown-linux-gnu-gcc FC=riscv64-unknown-linux-gnu-gfortran \