Update README: correct Clang-REPL CMake command

Remove incorrect Cling-specific flags from the Clang-REPL build instructions.
REPL mode is the default
Signed-off-by: AdityaPandeyCN <adityapand3y666@gmail.com>

Author: AdityaPandeyCN

README.md

@@ -209,7 +209,7 @@ Now CppInterOp can be built. This can be done by executing
 ```bash
 mkdir CppInterOp/build/
 cd CppInterOp/build/
-cmake -DBUILD_SHARED_LIBS=ON -DCPPINTEROP_USE_CLING=ON -DCPPINTEROP_USE_REPL=Off -DCling_DIR=$LLVM_DIR/build/tools/cling -DLLVM_DIR=$LLVM_DIR/build/lib/cmake/llvm -DClang_DIR=$LLVM_DIR/build/lib/cmake/clang -DCMAKE_INSTALL_PREFIX=$CPPINTEROP_DIR ..
+cmake -DBUILD_SHARED_LIBS=ON -DLLVM_DIR=$LLVM_DIR/build/lib/cmake/llvm -DClang_DIR=$LLVM_DIR/build/lib/cmake/clang -DCMAKE_INSTALL_PREFIX=$CPPINTEROP_DIR ..
 cmake --build . --target install --parallel $(nproc --all)
 ```