deps: update to atty 0.2.9

https://github.com/softprops/atty/pull/25 was merged, so we can upgrade.

1 files changed, 1 insertions, 1 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 3caf8381..5dc7f018 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,7 +33,7 @@ path = "tests/tests.rs"
 members = ["grep", "globset", "ignore", "termcolor", "wincolor"]
 
 [dependencies]
-atty = "=0.2.6"
+atty = "0.2.9"
 bytecount = "0.3.1"
 encoding_rs = "0.7"
 globset = { version = "0.4.0", path = "globset" }