Update Rust to 1.31.0

library/rust

@@ -1,14 +1,14 @@
-# this file is generated via https://github.com/rust-lang-nursery/docker-rust/blob/c34d6993e8f9403c18f348de85787f1585fd3375/generate-stackbrew-library.sh
+# this file is generated via https://github.com/rust-lang-nursery/docker-rust/blob/e7703b2cf525f2525bdf8d131cd66b5b38b1513c/generate-stackbrew-library.sh
 
 Maintainers: Steven Fackler <[email protected]> (@sfackler)
 GitRepo: https://github.com/rust-lang-nursery/docker-rust.git
 
-Tags: 1.30.1-stretch, 1-stretch, 1.30-stretch, stretch, 1.30.1, 1, 1.30, latest
+Tags: 1.31.0-stretch, 1-stretch, 1.31-stretch, stretch, 1.31.0, 1, 1.31, latest
 Architectures: amd64, arm32v7, arm64v8, i386
-GitCommit: c34d6993e8f9403c18f348de85787f1585fd3375
-Directory: 1.30.1/stretch
+GitCommit: e7703b2cf525f2525bdf8d131cd66b5b38b1513c
+Directory: 1.31.0/stretch
 
-Tags: 1.30.1-slim-stretch, 1-slim-stretch, 1.30-slim-stretch, slim-stretch, 1.30.1-slim, 1-slim, 1.30-slim, slim
+Tags: 1.31.0-slim-stretch, 1-slim-stretch, 1.31-slim-stretch, slim-stretch, 1.31.0-slim, 1-slim, 1.31-slim, slim
 Architectures: amd64, arm32v7, arm64v8, i386
-GitCommit: c34d6993e8f9403c18f348de85787f1585fd3375
-Directory: 1.30.1/stretch/slim
+GitCommit: e7703b2cf525f2525bdf8d131cd66b5b38b1513c
+Directory: 1.31.0/stretch/slim