Auto merge of #5190 - flip1995:nuke_traveyor, r=phansch,Manishearth,llogiq,flip1995

I like to move it, move it

GHA now runs in the background for 6 days (#5088)

Since then ~~15~~ 19 PRs were successfully merged and Travis+Appveyor agreed on the status in every case. ([GitHub PR search query](https://github.com/rust-lang/rust-clippy/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Amerged+merged%3A%3E%3D2020-02-12T15%3A42%3A00+sort%3Aupdated-desc+NOT+%5Bgh-pages%5D+in%3Atitle))

Some PRs were:
- #5163
- #5170
- #5168
- #5173
- #5171
- #5156
- #4809
- #5177
- #5182
- #5183
- #5184
- #5185
- #5186
- #5181
- #5189

Bug with GHA:
- When a rustc PR gets merged between the `integration_build` and the `integration` job, the `integration` job will fail. This happened once in #5162, but not in the past 6 days. Even if it would happen every 4th PR we would save time, since splitting up the integration build and tests saves 5-7 minutes per run and a complete run takes 15-17 minutes
- Sometimes the MacOS build takes up to an hour to download the master toolchain. Until now, this happend 2 or 3 times and can be resolved by a `@bors r3try`+canceling the previous run (restarting single jobs is not supported yet)

## Before merging this, rust-lang/rust-central-station#578 has to get merged

This PR is for starting the discussion and to get consensus (@rust-lang/clippy) on a final move to GHA. If we're ready, I'll contact Pietro, to finalize the move.

changelog: Clippy completely runs on GHA now 🎉

---

BTW: The deployment already runs on GHA, instead of Travis.

Author: bors

.github/deploy_key.enc

@@ -18,9 +18,7 @@ build = "build.rs"
 edition = "2018"
 publish = false
 
-[badges]
-travis-ci = { repository = "rust-lang/rust-clippy" }
-appveyor = { repository = "rust-lang/rust-clippy" }
+# [badges]
 # FIXME(flip1995): Add GHA badge once rust-lang/crates.io#1838 is merged
 
 [[bin]]

.travis.yml

@@ -1,7 +1,5 @@
 # Clippy
 
-[![Build Status](https://travis-ci.com/rust-lang/rust-clippy.svg?branch=master)](https://travis-ci.com/rust-lang/rust-clippy)
-[![Windows Build status](https://ci.appveyor.com/api/projects/status/id677xpw1dguo7iw?svg=true)](https://ci.appveyor.com/project/rust-lang-libs/rust-clippy)
 [![Clippy Test](https://github.com/rust-lang/rust-clippy/workflows/Clippy%20Test/badge.svg?branch=auto&event=push)](https://github.com/rust-lang/rust-clippy/actions?query=workflow%3A%22Clippy+Test%22+event%3Apush+branch%3Aauto)
 [![License: MIT OR Apache-2.0](https://img.shields.io/crates/l/clippy.svg)](#license)