Update README.md

Grammar and style.

README.md

@@ -3,7 +3,7 @@ Metasploit [![Build Status](https://travis-ci.org/rapid7/metasploit-framework.pn
 The Metasploit Framework is released under a BSD-style license. See
 COPYING for more details.
 
-The latest version of this software is available from https://metasploit.com/
+The latest version of this software is available from: https://metasploit.com
 
 Bug tracking and development information can be found at:
  https://github.com/rapid7/metasploit-framework
@@ -20,8 +20,8 @@ Questions and suggestions can be sent to:
 Installing
 --
 
-Generally, you should use [the free installer](https://www.metasploit.com/download)
-which contains all dependencies and will get you up and running with a
+Generally, you should use [the free installer](https://www.metasploit.com/download),
+which contains all the dependencies and will get you up and running with a
 few clicks. See the [Dev Environment Setup](http://r-7.co/MSF-DEV) if
 you'd like to deal with dependencies on your own.
 
@@ -34,10 +34,10 @@ resources](https://metasploit.github.io), or the [wiki].
 
 Contributing
 --
-See the [Dev Environment Setup][wiki-devenv] guide on GitHub which will
-walk you through the whole process starting from installing all the
+See the [Dev Environment Setup][wiki-devenv] guide on GitHub, which will
+walk you through the whole process from installing all the
 dependencies, to cloning the repository, and finally to submitting a
-pull request. For slightly more info, see
+pull request. For slightly more information, see
 [Contributing](https://github.com/rapid7/metasploit-framework/blob/master/CONTRIBUTING.md).