Update CONTRIBUTING.md

Author: ericglau

CONTRIBUTING.md

@@ -1,7 +1,7 @@
 Contributing to OpenZeppelin Upgrades
 =======
 
-Contributions to OpenZeppelin Upgrades are welcome. Please review the information below to test out and contribute your changes.
+Contributions to OpenZeppelin Upgrades are welcome. Please review the information below to test out and contribute your changes. 
 
 ## Building and testing the project
 
@@ -33,4 +33,4 @@ As a contributor, we ask that you fork this repository, work on your own fork an
 
 ### Adding Changesets
 If your PR modifies code under `packages`, you will need to add changesets to summarize the changes. The PR's `Changeset` GitHub check will give an error if this condition is not satisfied.
-- To add a changeset: from the root directory, run `yarn changeset`
+- To add a changeset: from the root directory, run `yarn changeset`