I understand this is a recent update to MacOS but just wanted get this on the roadmap if it hasn't been tackled already. Thanks :)

## Environments
__OS:__  OSX
__Selenium Version:__  Selenium server standalone <= 3.14.0
__Browser:__  Any
__Browser Version:__ Any

## Expected Behavior
Selenium Grid hub routes webdriver traffic to specified `platform[Name]: macos 10.14` or `mojave`

## Actual Behavior
No current support for node platform target MacOS 10.14 Mojave.
Desired capabilities `platform[Name]` set to `macos 10.14` or `mojave` fails to find corresponding selenium node.
__Workaround:__
Disable all other MacOS platform nodes and target `platform[Name]: "MAC"`

## Steps to reproduce -
Create a selenium grid with OSX 10.12/13 and 10.14.
Run tests with desired capabilities `platform[Name]: "mojave"`.

## Reference
Known and Supported Platforms that WebDriver runs on: 
https://github.com/SeleniumHQ/selenium/blob/master/java/client/src/org/openqa/selenium/Platform.java
Doesn't include identifier for MacOSX 10.14 Mojave
*
   * @param osName the operating system name to determine the platform of
   * @param osVersion the operating system version to determine the platform of
   * @return the most likely platform based on given operating system name and version
   */
  public static Platform extractFromSysProperty(String osName, String osVersion) {
    osName = osName.toLowerCase();
    
    if ("dalvik".equalsIgnoreCase(System.getProperty("java.vm.name"))) {
      return Platform.ANDROID;
    }
    
    if (osVersion.equals("6.2") && osName.startsWith("windows nt")) {
        return WIN8;
    }
    
    if (osVersion.equals("6.3") && osName.startsWith("windows nt")) {
        return WIN8_1;
    }
    Platform mostLikely = UNIX;
    String previousMatch = null;
    for (Platform os : Platform.values()) {
      for (String matcher : os.partOfOsName) {
        if ("".equals(matcher)) {
          continue;
        }
        matcher = matcher.toLowerCase();
        if (os.isExactMatch(osName, matcher)) {
          return os;
        }