Minor grammatical fixes to README.md

Added an Oxford comma for consistency, and clarified a slightly awkward sentence.

README.md

@@ -9,7 +9,7 @@ Visit the project's website at <http://ghost.org> &bull; docs on <http://support
 
 ## Getting Involved
 
-Want to report a bug, request a feature, contribute or translate Ghost? Check out our in-depth guide to [Contributing to Ghost](https://github.com/TryGhost/Ghost/blob/master/CONTRIBUTING.md). We need all the help we can get! You can also join in with our [community](https://github.com/TryGhost/Ghost#community) to keep up-to-date and meet other Ghosters.
+Want to report a bug, request a feature, contribute, or translate Ghost? Check out our in-depth guide to [Contributing to Ghost](https://github.com/TryGhost/Ghost/blob/master/CONTRIBUTING.md). We need all the help we can get! You can also join in with our [community](https://github.com/TryGhost/Ghost#community) to keep up-to-date and meet other Ghosters.
 
 
 ## Getting Started
@@ -87,7 +87,7 @@ Keep track of Ghost development and Ghost community activity.
 
 ## Versioning
 
-For transparency and insight into our release cycle, and for striving to maintain backward compatibility, Ghost will be maintained according to the [Semantic Versioning](http://semver.org/) guidelines as much as possible.
+For transparency and insight into our release cycle, along with striving to maintain backward compatibility, Ghost will be maintained according to the [Semantic Versioning](http://semver.org/) guidelines as much as possible.
 
 Releases will be numbered with the following format: