Update .travis.yml (#61)

* Update .travis.yml

* typo

* Update .travis.yml

* A slightly more modern set of compilers

* remove gdc for now as it's broken on travis

Author: John-Colvin

.travis.yml

@@ -4,32 +4,30 @@ os:
  - linux
  - osx
 
+osx_image: xcode9.3
+
 language: d
 
 d:
- - dmd-beta
+ - dmd-2.080.0
+ - dmd-2.079.1
+ - dmd-2.078.3
+ - dmd-2.077.1
+ - dmd-2.076.1
+ - dmd-2.075.1
  - dmd-2.074.1
- - dmd-2.073.2
- - dmd-2.072.2
- - dmd-2.071.2
- - dmd-2.070.2
- - dmd-2.069.2
- - dmd-2.068.2
- - dmd-2.067.1
- - dmd-2.066.1
+ - ldc-1.9.0
+ - ldc-1.8.0
+ - ldc-1.7.0
+ - ldc-1.6.0
+ - ldc-1.5.0
  - ldc-beta
- - ldc-1.2.0
- - ldc-1.1.1
- - ldc-1.0.0
- - ldc-0.17.2
- - ldc-0.16.1
- - ldc-0.15.1
- - gdc
+ - dmd-beta
+ - dmd
+ - ldc
 
 matrix:
   allow_failures:
-   - os: osx
-     d: gdc
    - d: dmd-beta
    - d: ldc-beta