Fix .travis.yml for macosx build

Author: craigbarnes

.travis.yml

@@ -11,6 +11,6 @@ script:
     - make check-lua-all
     - eval `luarocks-2.2.2/installation/bin/luarocks path`
     - make clean-obj all USE_LOCAL_LIBGUMBO=1 LUA_CFLAGS=-Ilua-5.3.1/src LUA=lua-5.3.1/src/lua LUA_PC=none
-    - LD_LIBRARY_PATH=gumbo-parser-0.10.1/.libs lua-5.3.1/src/lua -lluacov runtests.lua
+    - LD_LIBRARY_PATH=gumbo-parser-0.10.1/.libs DYLD_LIBRARY_PATH=gumbo-parser-0.10.1/.libs lua-5.3.1/src/lua -lluacov runtests.lua
 after_success:
     - luarocks-2.2.2/installation/bin/luacov-coveralls -t "$COVERALLS_TOKEN"