Fix possible buffer overread in wlan string

Update README.md

docs: fix simple typo, inconsitent -> inconsistent

Fix LGTM build configuration

Add LGTM badge

Mitigate FIXMEs

Arch package is stale, drop support

Test if channel is available for frame injection (fixes #10 and #13)

Fix typo

Fix glibc 2.20 warning

CMake: check for netlink libraries (fixes #25)

CMake: cleanup

Fix return value of poll_host_device

Add warning about `-N` flag

Use new version of radiotap library (fixes #32 and #34)