INSTALL.md uses manylinux wheels
INSTALL.md uses manylinux wheels

The installation instructions no longer recommend installation of the
GLPK development libraries on Linux, as the new manylinux wheels include
them.

zakandrewking/cobrapy,aebrahim/cobrapy,jeicher/cobrapy,zakandrewking/cobrapy,aebrahim/cobrapy,jeicher/cobrapy