Failed to build with liftoff

[appcenter[bot]]

AppCenter failed to build with liftoff.

Build Log

``` dpkg-checkbuilddeps: error: Unmet build dependencies: meson valac (>= 0.26.1) libgranite-dev (>= 0.3.0) libgtk-3-dev (>= 3.12.0) libgee-0.8-dev libsqlheavy-dev (>= 0.1.1-2) W: Unmet build-dependency in source dpkg-buildpackage: warning: using a gain-root-command while being root dpkg-buildpackage: source package com.github.cjfloss.envelope dpkg-buildpackage: source version 0.0.1 dpkg-buildpackage: source distribution xenial dpkg-buildpackage: source changed by cjfloss dpkg-source --before-build flightcheck fakeroot debian/rules clean debian/rules:29: *** missing separator. Stop. dpkg-buildpackage: error: fakeroot debian/rules clean gave error exit status 2 ```

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Affects: v0.0.1 release