v0.0.16

Breaking: Not compatible with RHEL 6 (now requires glibc >= 2.17 / RHEL 7)

Changes

• kpageflags-viewer: help message
• memstats: add tmpfs flags, custom /proc, process uid fix, better error messages for Oracle
• proc_snap: dump fds, add cwd
• update dependencies, remove unused dependencies, update rust nightly
• clippy lints