Update rustwide to 0.13.1

This includes rust-lang/rustwide#61 which addresses
breakage in the beta crater run.

Author: Mark-Simulacrum

Cargo.lock

@@ -60,7 +60,7 @@ hmac = "0.7"
 sha-1 = "0.8"
 rust_team_data = { git = "https://github.com/rust-lang/team" }
 systemstat = "0.1.4"
-rustwide = { version = "0.13.0", features = ["unstable", "unstable-toolchain-ci"] }
+rustwide = { version = "0.13.1", features = ["unstable", "unstable-toolchain-ci"] }
 percent-encoding = "2.1.0"
 remove_dir_all = "0.5.2"
 ctrlc = "3.1.3"