Bump MSRV to 1.38.0

Signed-off-by: Paul Osborne <[email protected]>

Author: posborne

.travis.yml

@@ -72,7 +72,7 @@ matrix:
 
     # MSRV
     - env: TARGET=x86_64-unknown-linux-gnu
-      rust: 1.36.0
+      rust: 1.38.0
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
 
 before_install:

README.md

@@ -175,7 +175,7 @@ to be considered reliable.
 
 ## Minimum Supported Rust Version (MSRV)
 
-This crate is guaranteed to compile on stable Rust 1.36.0 and up. It *might*
+This crate is guaranteed to compile on stable Rust 1.38.0 and up. It *might*
 compile with older versions but that may change in any new patch release.
 
 ## License