Merge pull request #1174 from volta-cli/dependabot/cargo/mockito-0.31.0

Bump mockito from 0.30.0 to 0.31.0

Author: chriskrycho

Cargo.lock

@@ -30,7 +30,7 @@ log = { version = "0.4", features = ["std"] }
 semver = { git = "https://github.com/mikrostew/semver", branch = "new-parser" }
 structopt = "0.2.14"
 cfg-if = "1.0"
-mockito = { version = "0.30.0", optional = true }
+mockito = { version = "0.31.0", optional = true }
 test-support = { path = "crates/test-support" }
 textwrap = "0.14.2"
 which = "4.2.4"