feat: add a default configuration file

The ~/.config/obnam/obnam.yaml file will be used as the configuration
file by default. The ~/.config directory can be overridden by setting
the XDG variable (XDG_CONFIG_HOME), or the whole file can be
overridden with the --config option to obnam.

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index e8bbd91..747deb0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,7 @@ edition = "2018"
 anyhow = "1"
 bytes = "0.5"
 chrono = "0.4"
+dirs = "3"
 indicatif = "0.15"
 libc = "0.2"
 log = "0.4"