exclude some more versions which just travis does not support

Author: valich

.travis.yml

@@ -24,11 +24,13 @@ matrix:
       rvm: 1.9.3
     - os: osx
       rvm: 2.0.0
+    - os: linux
+      rvm: 2.5.0-preview1
 
-  include:
-    - os: osx
-      rvm: 1.9.3
-      before_script: rvm install ruby-1.9.3 # not binary
-    - os: osx
-      rvm: 2.0.0
-      before_script: rvm install ruby-2.0.0 # not binary
+#  include:
+#    - os: osx
+#      rvm: 1.9.3
+#      before_script: rvm install ruby-1.9.3 # not binary
+#    - os: osx
+#      rvm: 2.0.0
+#      before_script: rvm install ruby-2.0.0 # not binary