Merge pull request #287 from dalek-cryptography/update-nightly-pin

Use rust-toolchain and update nightly version.

Author: hdevalence

.travis.yml

@@ -1,9 +1,6 @@
 language: rust
 cache: cargo
 
-rust:
-  - nightly-2018-12-31
-
 env:
   - TEST_COMMAND=test EXTRA_FLAGS='' FEATURES=''
   - TEST_COMMAND=test EXTRA_FLAGS='' FEATURES='yoloproofs'
@@ -14,7 +11,6 @@ env:
 matrix:
   fast_finish: true
   include:
-  - rust: nightly-2018-12-31
     before_script:
     - rustup component add rustfmt-preview
     script:

rust-toolchain

@@ -0,0 +1 @@
+nightly-2019-07-19