remove squeak 6 since it's not supported on smalltalk ci yet

Johan Brichau · Johan Brichau · commit b31288aae3a8 · 2017-05-25T14:07:15.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,6 @@ smalltalk:
   - Pharo-5.0
   - Pharo-4.0
   - Pharo-3.0
-  - Squeak-6.0
   - Squeak-5.1
   - GemStone-3.1.0.6
   - GemStone-3.2.16
