Bump version to 2.7.2

 Bump version to 2.7.1.

Bump version to v2.7.0

Bumb version to 2.6.0

Bump version to 2.5.1

Bump version to 2.5.0

v2.4.0: Bump nan version to support node v10

Merge branch 'master' of github.com:agnat/node_mdns

[2.2.11] Use NAN v2.1.0

Avahi probe: Test status before deallocating