Release v0.5.0

New features:

* `--chmod` changes permissions
* `--clearenv` unsets every environment variable (except `PWD`)
* `--perms` sets permissions for one subsequent `--bind-data`, `--dir`,
  `--file`, `--ro-bind-data` or `--tmpfs`

Other enhancements:

* Better diagnostics when a `--bind` or other bind-mount fails
* `zsh` tab-completion
* Better test coverage

Bug fixes:

* Use Python 3 for tests and examples
* Mount points for non-directories are created with permissions
  `-r--r--r--` instead of `-rw-rw-rw-`
* Don't remount items in `/proc` read-only if already `EROFS`, required
  to run under Docker
* Allow mounting an non-directory over an existing non-directory,
  e.g. `--bind "$XDG_RUNTIME_DIR/my-log-socket" /dev/log`
* Silence kernel messages for our bind-mounts
* Make sure `pkg-config` is checked for, regardless of build options
* Improve ability to bind-mount directories on case-insensitive filesystems
* Fix `-Wshadow` warnings
* Fix deprecation warnings with newer SELinux

Git-EVTag-v0-SHA512: b91b729ca27e1ccd86bcdefbc84c25cbecaf49e84f34d2d04c884c0bfbd6c96f56cf57bed0a3127f5ec12f6ab5b4032fb56ace276f66d95bb04f4ca5742e4315
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