Update rustwide to 0.15.2

Author: wesleywiser

Cargo.lock

@@ -55,7 +55,7 @@ hmac = "0.12"
 sha-1 = "0.10"
 rust_team_data = { git = "https://github.com/rust-lang/team" }
 systemstat = "0.1.11"
-rustwide = { version = "0.14.0", features = ["unstable", "unstable-toolchain-ci"] }
+rustwide = { version = "0.15.0", features = ["unstable", "unstable-toolchain-ci"] }
 percent-encoding = "2.1.0"
 remove_dir_all = "0.7"
 ctrlc = "3.1.3"