Add 2018 edition minimum Rust version requirement

2019-05-12 20:59:37 +02:00 · 2019-05-12 20:59:37 +02:00 · f3f2c68ad1
commit f3f2c68ad1
parent dbd69b6f57
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--- a/README.md
+++ b/README.md
@ -5,6 +5,8 @@

 Port of the [Mikkelsen Tangent Space Algorithm](https://en.blender.org/index.php/Dev:Shading/Tangent_Space_Normal_Maps) reference implementation.

+Requires at least Rust 1.31.0.
+
 ## Examples

 ### generate