Update greetings.yml PR message (#519)

* Update greetings.yml

* Update greetings.yml

.github/workflows/greetings.yml

     - uses: actions/first-interaction@v1
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
-        pr-message: 'Hello @${{ github.actor }}, thank you for submitting a PR! We will respond as soon as possible.'
+        pr-message: |
+          Hello @${{ github.actor }}, thank you for submitting a PR! To allow your work to be integrated as seamlessly as possible, we advise you to:
+          - Verify your PR is **up-to-date with origin/master.** If your PR is behind origin/master update by running the following, replacing 'feature' with the name of your local branch:
+          ```bash
+          git remote add upstream https://github.com/ultralytics/yolov5.git
+          git fetch upstream
+          git checkout feature  # <----- replace 'feature' with local branch name
+          git rebase upstream/master
+          git push -u origin -f
+          ```
+          - Verify all Continuous Integration (CI) **checks are passing**.
+          - Reduce changes to the absolute **minimum** required for your bug fix or feature addition. _"It is not daily increase but daily decrease, hack away the unessential. The closer to the source, the less wastage there is."_  -Bruce Lee
+
         issue-message: |
           Hello @${{ github.actor }}, thank you for your interest in our work! Please visit our [Custom Training Tutorial](https://github.com/ultralytics/yolov5/wiki/Train-Custom-Data) to get started, and see our [Jupyter Notebook](https://github.com/ultralytics/yolov5/blob/master/tutorial.ipynb) <a href="https://colab.research.google.com/github/ultralytics/yolov5/blob/master/tutorial.ipynb"><img src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open In Colab"></a>, [Docker Image](https://hub.docker.com/r/ultralytics/yolov5), and [Google Cloud Quickstart Guide](https://github.com/ultralytics/yolov5/wiki/GCP-Quickstart) for example environments.
             
           If this is a bug report, please provide screenshots and **minimum viable code to reproduce your issue**, otherwise we can not help you.
             
-          If this is a custom model or data training question, please note that Ultralytics does **not** provide free personal support. As a leader in vision ML and AI, we do offer professional consulting, from simple expert advice up to delivery of fully customized, end-to-end production solutions for our clients, such as:
+          If this is a custom model or data training question, please note Ultralytics does **not** provide free personal support. As a leader in vision ML and AI, we do offer professional consulting, from simple expert advice up to delivery of fully customized, end-to-end production solutions for our clients, such as:
           - **Cloud-based AI** systems operating on **hundreds of HD video streams in realtime.**
           - **Edge AI** integrated into custom iOS and Android apps for realtime **30 FPS video inference.**
           - **Custom data training**, hyperparameter evolution, and model exportation to any destination.