Silence compiler warning
Silence compiler warning

/home/travis/build/kimwalisch/primesieve/src/primesieve/PreSieve.cpp:27:35: error: 
      suggest braces around initialization of subobject
      [-Werror,-Wmissing-braces]
const array<uint_t, 9> primes = { 2, 3, 5, 7, 11, 13, 17, 19, 23 };
kimwalisch/primesieve,kimwalisch/primesieve,kimwalisch/primesieve