adding example for reviewers and changelog

This PR will add the ability to specify one or more individual users
or team names to the environment to request for review.

Signed-off-by: vsoch <vsochat@stanford.edu>

CHANGELOG.md

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+# CHANGELOG
+
+This is a manually generated log to track changes to the repository for each release. 
+Each section should include general headers such as **Implemented enhancements** 
+and **Merged pull requests**. All closed issued and bug fixes should be 
+represented by the pull requests that fixed them. Critical items to know are:
+
+ - renamed commands
+ - deprecated / removed commands
+ - changed defaults
+ - backward incompatible changes
+
+
+Versions correspond with GitHub releases that can be referenced with @ using actions.
+
+## [master](https://github.com/vsoch/pull-request-action/tree/master) (master)
+  - added support for reviewer (individual and team) assignments (1.0.4)
+  - added support for maintainer can modify and assignees (1.0.3)

examples/reviewers-example.yml

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+name: Pull Request on Branch Push
+on:
+  push:
+    branches-ignore:
+      - devel
+jobs:
+  auto-pull-request:
+    name: PullRequestAction
+    runs-on: ubuntu-latest
+    steps:
+      - name: pull-request-action
+        uses: vsoch/pull-request-action@1.0.4
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH_PREFIX: "update/"
+          PULL_REQUEST_BRANCH: "master"
+          PULL_REQUEST_REVIEWERS: vsoch