cnpy.cpp: fix memory leak in parsing shape field
cnpy.cpp: fix memory leak in parsing shape field

The shape array created at cnpy.cpp:80 was never delete-ed. Add a
delete[] call at cnpy.cpp:136 to address this. A better solution may be
to pass a std::vector<> reference to parse_npy_header().

allebacco/cnpy,rogersce/cnpy,Jerry-Ma/cnpy,Jerry-Ma/cnpy,allebacco/cnpy,rogersce/cnpy