bubblewrap v0.8.0

New features:

* Add `--disable-userns` option to prevent the sandbox from creating its own nested user namespace (#488)
* Add `--assert-userns-disabled` option to check that an existing userns was created with `--disable-userns` (#488)
* Give a clearer error message if the kernel doesn't have `CONFIG_SECCOMP` and `CONFIG_SECCOMP_FILTER` (#550)

Bug fixes:

* Fix test failure with recent versions of `capsh` (#544)
* Fix test failure since 0.7.0 when not using post-2013 GNU coreutils (#539)
* Fix test failure since 0.7.0 if bubblewrap is setuid (#539)

Git-EVTag-v0-SHA512: d01204613853596f38f2c4bc732207e47e0917b27786d27524e4d74ff692fcacdf3fc0043d2428e53003fb539c106c70de8d1ec9ed1c2999a2f9342038f91daa
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