chore: remove deprication notice (#31)

The test coverage action now runs without any additional steps.
We have made changes to pick up commit OIDs from env vars set by GitHub Actions. This means no git commands would need to be run, and safe directory addition is not required anymore.

Signed-off-by: Srijan Saurav <68371686+srijan-deepsource@users.noreply.github.com>

README.md

@@ -6,53 +6,6 @@ GitHub Action that enables you to upload your test coverage data to DeepSource e
 
 If you're not using DeepSource yet, [get started for free](https://deepsource.io/signup?utm_source=githubmarketplace&utm_medium=organic).
 
-## Notice
-
-If you’re using the Test coverage action, we recommend switching to using the DeepSource CLI directly.
-To do this, rather than using the `test-coverage-action` step, you can do the following:
-
-```yaml
-steps:
-  - name: Checkout code
-    uses: actions/checkout@v2
-    with:
-      ref: ${{ github.event.pull_request.head.sha }}
-
-  # Run your tests here ...
-
-  - name: Report test-coverage to DeepSource
-    run: |
-      # Install the CLI
-      curl https://deepsource.io/cli | sh
-
-      # Send the report to DeepSource
-      ./bin/deepsource report --analyzer test-coverage --key <language> --value-file <path/to/coverage/file>
-```
-
-If you want to continue using the Test coverage action, please add a step before the test coverage action, to add a
-`safe.directory` parameter to your `.gitconfig`:
-
-```yaml
-steps:
-  - name: Checkout code
-    uses: actions/checkout@v2
-    with:
-      fetch-depth: 50
-      ref: ${{ github.event.pull_request.head.sha }}
-
-  # ADD THIS STEP
-  - name: Add git safe.directory for container
-    run: |
-      mkdir -p /home/runner/work/_temp/_github_home
-      printf "[safe]\ndirectory = /github/workspace" > /home/runner/work/_temp/_github_home/.gitconfig
-
-  - name: Report test-coverage to DeepSource
-    uses: deepsourcelabs/test-coverage-action@master
-    with:
-      ... The rest of your config is explained in Usage section.
-```
-
-Read this [Discuss post](https://discuss.deepsource.io/t/breaking-deepsource-test-coverage-github-action/507) for more information.
 
 ## Usage