Release v3.1.0

• Add a --max-depth flag to limit recursion depth. For example, libtree --max-depth 1 <file> will show the resolved paths of direct dependencies only.

c3d1e50801db8cd71427cccc00bb033211b68727ee5ff9858d5a22048fae4891  libtree_aarch64
4608828d01c383fdf5c02535bcce70493955a38e46c1ae0a1063c667625d11da  libtree_armv6l
9df3671b92151c01f37f3b38c1377dd2b179e559a033d9e23a22c669cc1cdae2  libtree_armv7l
fb83c54196d77bee4ba83c42f014e5b8fc359d8b02114387f7ad46fedc83faf5  libtree_i686
8d85183200300437b935574f259ed01efce4319eaec8525d87096c698a0f4c70  libtree_x86_64