DOC: Remove readme= key

bluss · bluss · commit 69275e8b4e29 · 2017-08-27T19:29:53.000+02:00
crates.io doesn't support restructuredtext, so it doesn't look good.
diff --git a/Cargo.toml b/Cargo.toml
@@ -5,8 +5,6 @@ version = "0.10.4"
 authors = ["bluss"]
 license = "MIT/Apache-2.0"
 
-readme = "README.rst"
-
 repository = "https://github.com/bluss/rust-ndarray"
 documentation = "https://docs.rs/ndarray/"
 
