Auto merge of #3631 - phansch:add_itertools_to_integration_tests, r=phansch

Add itertools to integration tests

Mainly because it causes an ICE in rust-lang/rust#57298
and it's a good library to test anyway.

Author: bors

.travis.yml

@@ -71,6 +71,8 @@ matrix:
       if: repo =~ /^rust-lang\/rust-clippy$/
     - env: INTEGRATION=hyperium/hyper
       if: repo =~ /^rust-lang\/rust-clippy$/
+    - env: INTEGRATION=bluss/rust-itertools
+      if: repo =~ /^rust-lang\/rust-clippy$/
   allow_failures:
   - os: windows
     env: CARGO_INCREMENTAL=0 BASE_TESTS=true