Auto merge of #3950 - phansch:update_changelog, r=Manishearth

Update changelog for Rust 1.34.0

[Rendered](https://github.com/phansch/rust-clippy/blob/update_changelog/CHANGELOG.md#rust-134-2019-04-10)

Author: bors

CHANGELOG.md

@@ -4,7 +4,35 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased / In Rust Beta or Nightly
 
-[1b89724...master](https://github.com/rust-lang/rust-clippy/compare/1b89724...master)
+[1fac380...master](https://github.com/rust-lang/rust-clippy/compare/1fac380...master)
+
+## Rust 1.34 (2019-04-10)
+
+[1b89724...1fac380](https://github.com/rust-lang/rust-clippy/compare/1b89724...1fac380)
+
+* New lint: [`assertions_on_constants`] to detect for example `assert!(true)`
+* New lint: [`dbg_macro`] to detect uses of the `dbg!` macro
+* New lint: [`missing_const_for_fn`] that can suggest functions to be made `const`
+* New lint: [`too_many_lines`] to detect functions with excessive LOC. It can be
+  configured using the `too-many-lines-threshold` configuration.
+* New lint: [`wildcard_enum_match_arm`] to check for wildcard enum matches using `_`
+* Expand `redundant_closure` to also work for methods (not only functions)
+* Fix ICEs in `vec_box`, `needless_pass_by_value` and `implicit_hasher`
+* Fix false positive in `cast_sign_loss`
+* Fix false positive in `integer_arithmetic`
+* Fix false positive in `unit_arg`
+* Fix false positives in `implicit_return`
+* Add suggestion to `explicit_write`
+* Improve suggestions for `question_mark` lint
+* Fix incorrect suggestion for `cast_lossless`
+* Fix incorrect suggestion for `expect_fun_call`
+* Fix incorrect suggestion for `needless_bool`
+* Fix incorrect suggestion for `needless_range_loop`
+* Fix incorrect suggestion for `use_self`
+* Fix incorrect suggestion for `while_let_on_iterator`
+* Clippy is now slightly easier to invoke in non-cargo contexts. See
+  [#3665][pull3665] for more details.
+* We now have [improved documentation][adding_lints] on how to add new lints
 
 ## Rust 1.33 (2019-02-26)
 
@@ -763,6 +791,8 @@ All notable changes to this project will be documented in this file.
 [`AsMut`]: https://doc.rust-lang.org/std/convert/trait.AsMut.html
 [`AsRef`]: https://doc.rust-lang.org/std/convert/trait.AsRef.html
 [configuration file]: ./rust-clippy#configuration
+[pull3665]: https://github.com/rust-lang/rust-clippy/pull/3665
+[adding_lints]: https://github.com/rust-lang/rust-clippy/blob/master/doc/adding_lints.md
 
 <!-- begin autogenerated links to lint list -->
 [`absurd_extreme_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#absurd_extreme_comparisons