docs: Correcting *.md files using Grammarly (#97)

Author: pushkyn

CHANGELOG.md

@@ -87,14 +87,14 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### BREAKING Change
 - [Pull #14](https://github.com/sendgrid/java-http-client/pull/14): Make response have private variables
 - Fixed [Issue #12](https://github.com/sendgrid/java-http-client/issues/12): The public Response variables should be private
-- The breaking change is that variables that were public are now private and accessable only via getters and setters
+- The breaking change is that variables that were public are now private and accessible only via getters and setters
 - BIG thanks to [Diego Camargo](https://github.com/belfazt) for the pull request!
 
 ## [3.0.0] - 2016-10-06
 ### BREAKING Change
 - [Pull #15](https://github.com/sendgrid/java-http-client/pull/15): Update the request object with sensible defaults and access methods
 - Fixes [Issue #13](https://github.com/sendgrid/java-http-client/issues/13): Update the Request object with sensible defaults and access methods
-- The breaking change is that variables that were public are now private and accessable only via getters and setters
+- The breaking change is that variables that were public are now private and accessible only via getters and setters
 - BIG thanks to [Diego Camargo](https://github.com/belfazt) for the pull request!
 
 ## [2.3.4] - 2016-08-09

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-Hello! Thank you for choosing to help contribute to one of the SendGrid open source projects. There are many ways you can contribute and help is always welcome.  We simply ask that you follow the following contribution policies.
+Hello! Thank you for choosing to help contribute to one of the SendGrid open source projects. There are many ways you can contribute and help is always welcome. We simply ask that you follow the following contribution policies.
 
 - [Feature Request](#feature-request)
 - [Submit a Bug Report](#submit-a-bug-report)
@@ -9,7 +9,7 @@ Hello! Thank you for choosing to help contribute to one of the SendGrid open sou
 - [Creating a Pull Request](#creating-a-pull-request)
 - [Code Reviews](#code-reviews)
 
-We use [Milestones](https://github.com/sendgrid/java-http-client/milestones) to help define current roadmaps, please feel free to grab an issue from the current milestone. Please indicate that you have begun work on it to avoid collisions. Once a PR is made, community review, comments, suggestions and additional PRs are welcomed and encouraged.
+We use [Milestones](https://github.com/sendgrid/java-http-client/milestones) to help define current roadmaps, please feel free to grab an issue from the current milestone. Please indicate that you have begun work on it to avoid collisions. Once a PR is made, community review, comments, suggestions, and additional PRs are welcomed and encouraged.
 
 <a name="feature-request"></a>
 ## Feature Request
@@ -31,7 +31,7 @@ A software bug is a demonstrable issue in the code base. In order for us to diag
 Before you decide to create a new issue, please try the following:
 
 1. Check the Github issues tab if the identified issue has already been reported, if so, please add a +1 to the existing post.
-2. Update to the latest version of this code and check if issue has already been fixed
+2. Update to the latest version of this code and check if the issue has already been fixed
 3. Copy and fill in the Bug Report Template we have provided below
 
 ### Please use our Bug Report Template
@@ -157,7 +157,7 @@ Please run your code through:
 
 4. Commit your changes in logical chunks. Please adhere to these [git commit
    message guidelines](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
-   or your code is unlikely be merged into the main project. Use Git's
+   or your code is unlikely to be merged into the main project. Use Git's
    [interactive rebase](https://help.github.com/articles/interactive-rebase)
    feature to tidy up your commits before making them public.