main(): Open repository even if PWD is a subdirectory

Previously, running `git todo` outside the root of the repository would
result in this error:

    error: unable to open repository: could not find repository from '.'; class=Repository (6); code=NotFound (-3)

It turns out the `open()` method expects the given path to be the
repository root. Use `open_from_env()` instead, which functions more
like regular Git commands.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 1a41001..775dfae 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -50,7 +50,7 @@ fn main() {
         process::exit(exitcode::OK);
     }
 
-    let repo = match Repository::open(".") {
+    let repo = match Repository::open_from_env() {
         Ok(r) => r,
         Err(e) => {
             eprintln(&format!("unable to open repository: {}", e));