fix travis

Author: 9il

test_examples.sh

@@ -12,5 +12,5 @@ git clone https://github.com/libmir/mir-core
 # compile the examples
 for file in $(find out -name "*.d") ; do
     echo "Testing: $file"
-    $DMD -unittest -Isource -Imir-core/source -c -o- "$file"
+    $DMD -unittest -Isource -Imir-core/source -preview=dip1008 -c -o- "$file"
 done