Updaitng README

README.md

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 PHP PhantomJS
 =============
 
+> #### Important
+> Currently when installing PHP PhantomJS on **Linux OS** you will need to compile your own version of PhantomJS for your system. This is due to an [unresolved issue](https://github.com/ariya/phantomjs/issues/12948) with the PhantomJS Linux packages. An Ubuntu compiled version will be installed by default but this may not be compatible with your system.
+
 PHP PhantomJS is a flexible PHP library to load pages through the PhantomJS 
 headless browser and return the page response. It is handy for testing
 websites that demand javascript support and also supports screen captures.