Temporarily disable CI for nightly

Author: tomhoule

.travis.yml

@@ -2,7 +2,7 @@ language: rust
 rust:
   - stable
   - beta
-  - nightly
+  # - nightly
 cache: cargo
 before_script:
   - if [ "$TRAVIS_RUST_VERSION" = "nightly" ]; then (rustup component add rustfmt-preview clippy-preview) fi