chore: bump v0.3.1

Cargo.lock

@@ -1509,7 +1509,7 @@ dependencies = [
 
 [[package]]
 name = "rathole"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "anyhow",
  "async-trait",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rathole"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 authors = ["Yujia Qiao <code@rapiz.me>"]
 description = "A reverse proxy for NAT traversal"