Update gz_install.sh

These two packages (libyaml and libzip) are necessary to compile gz-fuel-tools.

gz_install.sh

@@ -161,7 +161,7 @@ printf '\033[34m%.0s=\033[0m' {1..75} && echo
 echo -e "\033[36m> Installing Gazebo Harmonic dependencies with Brew...\033[0m"
 brew update
 brew tap osrf/simulation
-brew install assimp boost bullet cmake cppzmq [email protected] doxygen \
+brew install libyaml libzip assimp boost bullet cmake cppzmq [email protected] doxygen \
      eigen fcl ffmpeg flann freeimage freetype gdal gflags google-benchmark \
      gts ipopt jsoncpp libccd libyaml libzzip libzip nlopt ode open-scene-graph \
      ossp-uuid ogre1.9 ogre2.3 pkg-config protobuf qt@5 qwt-qt5 rapidjson ruby \
@@ -310,4 +310,4 @@ echo
 echo "To deactivate this workspace, run:"
 echo -e "\033[33mdeactivate\n\n\033[0m"
 
-# popd || exit
+# popd || exit