Update rustyline

The version was locked to 9.0.0 previsouly because Rust 1.56 requirement.
New version 9.1.1 should support 1.56 again.

Cargo.lock

@@ -2259,9 +2259,9 @@ dependencies = [
 
 [[package]]
 name = "nix"
-version = "0.22.0"
+version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf1e25ee6b412c2a1e3fcb6a4499a5c1bfe7f43e014bdce9a6b6666e5aa2d187"
+checksum = "f305c2c2e4c39a82f7bf0bf65fb557f9070ce06781d4f2454295cc34b1c43188"
 dependencies = [
  "bitflags",
  "cc",
@@ -3121,9 +3121,9 @@ checksum = "f2cc38e8fa666e2de3c4aba7edeb5ffc5246c1c2ed0e3d17e560aeeba736b23f"
 
 [[package]]
 name = "rustyline"
-version = "9.0.0"
+version = "9.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "790487c3881a63489ae77126f57048b42d62d3b2bafbf37453ea19eedb6340d6"
+checksum = "6c38cfbd0a4d7df7aab7cf53732d5d43449d0300358fd15cd4e8c8468a956aca"
 dependencies = [
  "bitflags",
  "cfg-if 1.0.0",

Cargo.toml

@@ -56,7 +56,7 @@ rand = "0.7"
 regex = "1.5"
 rusqlite = "0.26"
 rust-hsluv = "0.1"
-rustyline = { version = "=9.0.0", optional = true }
+rustyline = { version = "9", optional = true }
 sanitize-filename = "0.3"
 serde_json = "1.0"
 serde = { version = "1.0", features = ["derive"] }