Update MSRV

.travis.yml

@@ -7,7 +7,7 @@ env:
 rust:
   - nightly
   - stable
-  - 1.30.0 # MSRV
+  - 1.31.0 # MSRV
 
 if: (branch = staging OR branch = trying OR branch = master) OR (type = pull_request AND branch = master)
 

README.md

@@ -12,7 +12,7 @@ This project is developed and maintained by the [RISC-V team][team].
 
 ## Minimum Supported Rust Version (MSRV)
 
-This crate is guaranteed to compile on stable Rust 1.30.0 and up. It *might*
+This crate is guaranteed to compile on stable Rust 1.31.0 and up. It *might*
 compile with older versions but that may change in any new patch release.
 
 ## License

src/lib.rs

@@ -2,7 +2,7 @@
 //!
 //! # Minimum Supported Rust Version (MSRV)
 //!
-//! This crate is guaranteed to compile on stable Rust 1.30 and up. It *might*
+//! This crate is guaranteed to compile on stable Rust 1.31 and up. It *might*
 //! compile with older versions but that may change in any new patch release.
 //! Note that `riscv64imac-unknown-none-elf` and `riscv64gc-unknown-none-elf` targets
 //! are not supported on stable yet.