Bump cfg-if from 0.1.4 to 0.1.5

Bumps [cfg-if](https://github.com/alexcrichton/cfg-if) from 0.1.4 to 0.1.5.
- [Release notes](https://github.com/alexcrichton/cfg-if/releases)
- [Commits](rust-lang/cfg-if@0.1.4...0.1.5)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

Cargo.lock

@@ -18,7 +18,7 @@ regex = "1.0.2"
 structopt = { version = "0.2", optional = true }
 twiggy-traits = { version = "=0.2.0", path = "../traits" }
 wasm-bindgen = { version = "0.2.15", optional = true }
-cfg-if = "0.1.4"
+cfg-if = "0.1.5"
 
 [features]
 default = ["cli", "emit_csv", "emit_json", "emit_text"]