Prepare 0.2.7 release

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

Author: JohnTitor

Cargo.toml

@@ -8,7 +8,7 @@ license = "MIT OR Apache-2.0"
 name = "libm"
 readme = "README.md"
 repository = "https://github.com/rust-lang/libm"
-version = "0.2.6"
+version = "0.2.7"
 edition = "2018"
 
 [features]