Rename crate to "tester"

Fixes messense#3

Author: Manishearth

Cargo.toml

@@ -1,14 +1,14 @@
 [package]
 name = "tester"
-version = "0.6.0"
+version = "0.7.0"
 authors = ["The Rust Project Developers"]
 license = "MIT OR Apache-2.0"
 description = "A fork of Rust’s `test` crate that doesn’t require unstable language features."
 repository = "https://github.com/messense/rustc-test"
 edition = "2018"
 
 [lib]
-name = "test"
+name = "tester"
 crate-type = ["dylib", "rlib"]
 
 [features]