Update README due to release of Crystal Clemmys Patch Release 4

Fix #NONE

Author: Minggang Wang

.circleci/config.yml

@@ -20,12 +20,9 @@ jobs:
     - run: brew update
     - run: brew uninstall python
     - run: brew install python
-    - run: brew install wget cmake cppcheck tinyxml eigen pcre poco
+    - run: brew install wget cmake cppcheck tinyxml tinyxml2 eigen pcre poco
     - run: brew install openssl
     - run: brew install asio
-    - run: brew tap osrf/simulation
-    - run: brew install osrf/simulation/[email protected]
-    - run: brew link --force [email protected]
     - run: python3 -m pip install catkin_pkg empy git+https://github.com/lark-parser/[email protected] pyparsing pyyaml setuptools argcomplete colcon-common-extensions numpy
     - run: mkdir -p ~/ros2_install && cd ~/ros2_install && wget https://ci.ros2.org/view/packaging/job/packaging_osx/lastSuccessfulBuild/artifact/ws/ros2-package-osx-x86_64.tar.bz2 && tar xf ros2-package-osx-x86_64.tar.bz2
     - run: wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash

README.md

@@ -83,7 +83,7 @@ If you want to select a stable release of ROS 2.0 as your platform, please check
 
 ROS 2.0 release | NPM version |
 :------------: |  :-------------: |
-Crystal Clemmys Patch Release [1](https://github.com/ros2/ros2/releases/tag/release-crystal-20190117)/[2](https://github.com/ros2/ros2/releases/tag/release-crystal-20190214) | [0.9.0](https://www.npmjs.com/package/rclnodejs/v/0.9.0) | [crystal-clemmys](https://github.com/RobotWebTools/rclnodejs/tree/crystal-clemmys)
+Crystal Clemmys Patch Release [1](https://github.com/ros2/ros2/releases/tag/release-crystal-20190117)/[2](https://github.com/ros2/ros2/releases/tag/release-crystal-20190214)/[3](https://github.com/ros2/ros2/releases/tag/release-crystal-20190314)/[4](https://github.com/ros2/ros2/releases/tag/release-crystal-20190408)| [0.9.0](https://www.npmjs.com/package/rclnodejs/v/0.9.0) | [crystal-clemmys](https://github.com/RobotWebTools/rclnodejs/tree/crystal-clemmys) |
 [Bouncy Bolson](https://github.com/ros2/ros2/releases/tag/release-bouncy) | [0.3.5](https://www.npmjs.com/package/rclnodejs/v/0.3.5) | [bouncy-bolson](https://github.com/RobotWebTools/rclnodejs/tree/bouncy-bolson)
 
 * Install from npmjs: run `npm i rclnodejs@<version>` to install a specific version.