Bump minimum rust version to 1.21

Needed for `From<&[T]> for Arc<T>`
rust-lang · Oct 8, 2018 · d4ad8b3 · d4ad8b3
1 parent a8f81a5
commit d4ad8b3
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diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ dist: trusty
 sudo: required
 language: rust
 rust:
-  - 1.20.0
+  - 1.21.0
   - stable
   - beta
   - nightly

diff --git a/README.md b/README.md
@@ -210,7 +210,7 @@ recommended for general use.
 
 ### Minimum Rust version policy
 
-This crate's minimum supported `rustc` version is `1.20.0`.
+This crate's minimum supported `rustc` version is `1.21.0`.
 
 The current **tentative** policy is that the minimum Rust version required
 to use this crate can be increased in minor version updates. For example, if