Lower libpeas version requirement to 2.0.0 for compatibility with
current Gentoo stable.

--- a/meson.build
+++ b/meson.build
@@ -19,7 +19,7 @@
 graphene_dep = dependency('graphene-gobject-1.0')
 libadwaita_dep = dependency('libadwaita-1', version: '>= 1.8.0')
 introspection_dep = dependency('gobject-introspection-1.0', version: '>=0.10.1')
-peas_dep = dependency('libpeas-2', version: '>=2.2.0')
+peas_dep = dependency('libpeas-2', version: '>=2.0.0')
 gom_dep = dependency('gom-1.0', version: '>=0.5.0')
 gstreamer_dep = dependency('gstreamer-1.0', version: '>=1.0.10')
 json_dep = dependency('json-glib-1.0', version: '>=1.6.2')