add a note about getopts constraints

rust-lang · Jul 19, 2020 · 70e114c · 70e114c
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commit 70e114c
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diff --git a/README.md b/README.md
@@ -13,3 +13,7 @@ Add this to your `Cargo.toml`:
 [dependencies]
 getopts = "0.2"
 ```
+
+## Contributing
+
+The `getopts` library is used by `rustc`, so we have to be careful about not changing its behavior.