Remove badges in README.md (rust-itertools#890)

Co-authored-by: Jack Wrenn <[email protected]>

Author: 2 people

README.md

@@ -4,9 +4,6 @@ Extra iterator adaptors, functions and macros.
 
 Please read the [API documentation here](https://docs.rs/itertools/).
 
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 How to use with Cargo:
 
 ```toml