coryhouse#572: Add documentation for preparing macOS environment and …

…update version of the "hard-source-webpack-plugin" (coryhouse#573)

* Resolves coryhouse#572: Add documentation for preparing macOS environment and update version of the "hard-source-webpack-plugin"

* Resolves coryhouse#572: Be more concrete in the documentation

* Streamline wording

README.md

@@ -63,15 +63,19 @@ Why Slingshot?
 
 3. **[Disable safe write in your editor](https://webpack.js.org/guides/development/#adjusting-your-text-editor)** to assure hot reloading works properly.
 
-4. On a Mac? You're all set. If you're on Linux or Windows, complete the steps for your OS below.
+4. Complete the steps below for your operating system:
 
-    ### On Linux
+    ### macOS
+
+    * Install [watchman](https://facebook.github.io/watchman/) via `brew install watchman` or fswatch via `brew install fswatch` to avoid [this issue](https://github.com/facebook/create-react-app/issues/871) which occurs if your macOS has no appropriate file watching service installed.
+
+    ### Linux
 
     * Run this to [increase the limit](http://stackoverflow.com/questions/16748737/grunt-watch-error-waiting-fatal-error-watch-enospc) on the number of files Linux will watch. [Here's why](https://github.com/coryhouse/react-slingshot/issues/6).
 
         `echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p`.
 
-    ### On Windows
+    ### Windows
 
     * **Install [Python 2.7](https://www.python.org/downloads/)**. Some node modules may rely on node-gyp, which requires Python on Windows.
     * **Install C++ Compiler**. Browser-sync requires a C++ compiler on Windows.

package.json

@@ -67,7 +67,7 @@
     "eslint-watch": "3.1.2",
     "extract-text-webpack-plugin": "4.0.0-beta.0",
     "file-loader": "1.1.11",
-    "hard-source-webpack-plugin": "0.6.4",
+    "hard-source-webpack-plugin": "0.7.4",
     "history": "4.6.0",
     "html-webpack-plugin": "3.2.0",
     "identity-obj-proxy": "3.0.0",