Unversioned glib dependency in README.md

[cdr255]

Issue

In README.md one of the dependencies listed for Linux is glib when the project actually depends on glib-2.0 or glib2.

Explanation

glib-1.2 is still in common use on many systems, and (at least on Fedora 28) depending on glib assumes You need that and not glib-2.0. Since glib2 is required, and is even checked for in CMakeLists.txt, it should be noted as such in the README.md.

Solution

Update README.md to reference the correct version of glib (Possibly also introducing version requirements for the other listed packages).

[cdr255]

In a similar vein, xml2 should really be libxml2, as there is a different project with the name xml2 already.