Update travis script for 2019.

.travis.yml

@@ -1,24 +1,15 @@
-language: rust
+language: cpp
-rust:
+dist: bionic
-    - stable
+compiler:
-    - beta
+    - clang
-    - nightly
+    - gcc
-    - 1.28.0 # Ubuntu Bionic and Xenial
 
-matrix:
-    allow_failures:
-        - rust: nightly
-        - rust: 1.28.0
-    fast_finish: true
-
-cache: cargo
 
 # Custom directory, for the correct year
 before_script:
-    - cd 2018
+    - cd 2019
 
-# After success on stable, run benchmark
+# CMake build
-after_success:
+script:
-    - if [ "$TRAVIS_RUST_VERSION" == "stable" ]; then
+    - cmake .
-          cargo bench;
+    - make
-      fi