travis CHANGE add missing pcre2 dependency for OS X build
diff --git a/.travis.yml b/.travis.yml
index f68e2ae..bd3878e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -85,5 +85,6 @@
         - tar -xf cmocka-1.1.2.tar.xz
         - cd cmocka-1.1.2; mkdir build; cd build; cmake .. && make -j2 && sudo make install; cd ../..
         - brew update
+        - brew install pcre2
       script:
         - mkdir build && cd build; cmake -DENABLE_VALGRIND_TESTS=OFF .. && make -j2 && ctest --output-on-failure; cd -