Travis: Disable vibe tests for older compilers that don't work with vibe-core.

Author: Abscissa

.travis.yml

@@ -165,21 +165,21 @@ matrix:
       env: USE_UNIT_THREADED=true
     - d: dmd-2.076.1
     - d: dmd-2.075.1
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd-2.074.1
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd-2.073.1
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd-2.072.2
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd-2.071.2
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd-2.070.2
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd-2.069.2
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd-2.068.2
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-1.17.0
     - d: ldc-1.16.0
       env: USE_UNIT_THREADED=true
@@ -204,27 +204,27 @@ matrix:
     - d: ldc-1.6.0
       env: USE_UNIT_THREADED=true
     - d: ldc-1.5.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-1.4.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-1.3.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-1.2.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-1.1.1
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-1.0.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-0.17.5
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-0.17.1
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: ldc-0.17.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: gdc-6.3.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: gdc-4.8.5
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
     - d: dmd
     - d: dmd-beta
     - d: ldc
@@ -304,12 +304,12 @@ matrix:
       osx_image: xcode9.4 # use OSX 10.13
 
     - d: dmd-2.068.2
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
       os: osx
       osx_image: xcode9.4 # use OSX 10.13
 
     - d: ldc-0.17.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
       os: osx
       osx_image: xcode9.4 # use OSX 10.13
 
@@ -367,11 +367,11 @@ matrix:
       osx_image: xcode9.4 # use OSX 10.13
 
     - d: dmd-2.068.2
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
       os: osx
       osx_image: xcode9.4 # use OSX 10.13
 
     - d: ldc-0.17.0
-      env: DUB_SELECT=vibecore-1.0.0
+      env: NO_VIBE=true
       os: osx
       osx_image: xcode9.4 # use OSX 10.13