readme: switch Cargo.toml dependency version to "1"

BurntSushi · BurntSushi · commit 5e79f629a3be · 2022-12-15T11:07:02.000-05:00
Getting PRs to update this version when I invariably forget to update it
after a release is way too annoying. So just set it to "1".
diff --git a/README.md b/README.md
@@ -29,7 +29,7 @@ Add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-bstr = "1.0.1"
+bstr = "1"
 ```
 
 
