From: lukaslueg <lukas.lueg@gmail.com>
Date: Fri, 22 Sep 2017 15:08:31 +0000 (+0200)
Subject: Update CONTRIBUTING.md
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Update CONTRIBUTING.md

Point out that code added to Cargo may raise the minimal version of Rust required. Cargo does not have a grace period where it has to compile on "stable -2" or anything like that.
---

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d3ff879c3..cb0618b15 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -18,6 +18,10 @@ installed locally, ignore the cross-compile test failures, or disable them by
 using `CFG_DISABLE_CROSS_TESTS=1 cargo test`. Note that some tests are enabled
 only on nightly toolchain.
 
+## Minimal version of Rust
+
+Cargo must compile on stable Rust. Code added to Cargo is encouraged to use
+the latest stable features of the language and `stdlib`.
 
 ## Contributing to the Docs