.github: update Go versions to 1.25.x and 1.26.x

hostsfile: lower module Go version to 1.17

.github: update the workflow runner

lib: improve the package documentation

readme: add new install instructions

1.6

cmd: exit with 0 after printing the version

cmd: shorten version to "1.5"

1.5.0

Makefile: default release bumps minor version

1.4.1

Makefile: fix bump_version invocation

all: fix staticheck flags

.github: add GH actions, remove Travis

README.md: update godoc