Update lint documentation using util/update_lints.py

Author: theemathas

CHANGELOG.md

@@ -268,6 +268,7 @@ All notable changes to this project will be documented in this file.
 [`diverging_sub_expression`]: https://github.com/Manishearth/rust-clippy/wiki#diverging_sub_expression
 [`doc_markdown`]: https://github.com/Manishearth/rust-clippy/wiki#doc_markdown
 [`double_neg`]: https://github.com/Manishearth/rust-clippy/wiki#double_neg
+[`double_parens`]: https://github.com/Manishearth/rust-clippy/wiki#double_parens
 [`drop_ref`]: https://github.com/Manishearth/rust-clippy/wiki#drop_ref
 [`duplicate_underscore_argument`]: https://github.com/Manishearth/rust-clippy/wiki#duplicate_underscore_argument
 [`empty_loop`]: https://github.com/Manishearth/rust-clippy/wiki#empty_loop

README.md

@@ -179,7 +179,7 @@ transparently:
 
 ## Lints
 
-There are 180 lints included in this crate:
+There are 181 lints included in this crate:
 
 name | default | triggers on
 -----------------------------------------------------------------------------------------------------------------------|---------|----------------------------------------------------------------------------------------------------------------------------------
@@ -216,6 +216,7 @@ name
 [diverging_sub_expression](https://github.com/Manishearth/rust-clippy/wiki#diverging_sub_expression) | warn | whether an expression contains a diverging sub expression
 [doc_markdown](https://github.com/Manishearth/rust-clippy/wiki#doc_markdown) | warn | presence of `_`, `::` or camel-case outside backticks in documentation
 [double_neg](https://github.com/Manishearth/rust-clippy/wiki#double_neg) | warn | `--x`, which is a double negation of `x` and not a pre-decrement as in C/C++
+[double_parens](https://github.com/Manishearth/rust-clippy/wiki#double_parens) | warn | Warn on unnecessary double parentheses
 [drop_ref](https://github.com/Manishearth/rust-clippy/wiki#drop_ref) | warn | calls to `std::mem::drop` with a reference instead of an owned value
 [duplicate_underscore_argument](https://github.com/Manishearth/rust-clippy/wiki#duplicate_underscore_argument) | warn | function arguments having names which only differ by an underscore
 [empty_loop](https://github.com/Manishearth/rust-clippy/wiki#empty_loop) | warn | empty `loop {}`, which should block or sleep