fix typo

Author: dsieger

.travis.yml

@@ -50,7 +50,7 @@ before_install:
 before_script:
   - mkdir build
   - cd build
-  - if [ "$CONFIG" != "Alternatives" ]; then cmake -DCMAKE_BUILD_TYPE=${CONFIG} .. ; else cmake -DCMAKE_BUILD_TYPE=Debug -DPMP_INDEXT_TYPE=64 -DPMP_SCALAR_TYPE=64 .. ; fi
+  - if [ "$CONFIG" != "Alternatives" ]; then cmake -DCMAKE_BUILD_TYPE=${CONFIG} .. ; else cmake -DCMAKE_BUILD_TYPE=Debug -DPMP_INDEX_TYPE=64 -DPMP_SCALAR_TYPE=64 .. ; fi
 
 script:
   - make -j 2