remove old compilers

Author: John-Colvin

.travis.yml

@@ -8,22 +8,11 @@ os:
 language: d
 
 d:
+ - dmd
+ - ldc
  - dmd-beta
- - 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
  - ldc-beta
  - gdc
- - dmd-beta
- - ldc-beta
- - dmd
- - ldc
 
 matrix:
   allow_failures: