Fix underspecified version.

Author: tyler

Cargo.toml

@@ -14,7 +14,7 @@ name = "clif-util"
 path = "src/clif-util.rs"
 
 [dependencies]
-cfg-if = "0.1"
+cfg-if = "0.1.6"
 cranelift-codegen = { path = "lib/codegen", version = "0.26.0" }
 cranelift-entity = { path = "lib/entity", version = "0.26.0" }
 cranelift-reader = { path = "lib/reader", version = "0.26.0" }