RF: Update pep8speaks config to test all files in the repo

Author: Jacob Roberts

.pep8speaks.yml

@@ -1,12 +1,14 @@
 scanner:
-    diff_only: True  # Only show errors caused by the patch
+    # Only show errors caused by the patch. False means we check everything
+    # according to the config for flake8 in setup.cfg
+    diff_only: False
     linter: flake8
 
-message:  # Customize the comment made by the bot
-    opened:  # Messages when a new PR is submitted
+message: # Customize the comment made by the bot
+    opened: # Messages when a new PR is submitted
         header: "Hello @{name}, thank you for submitting the Pull Request!"
         footer: "To test for issues locally, `pip install flake8` and then run `flake8 nibabel`."
-    updated:  # Messages when new commits are added to the PR
+    updated: # Messages when new commits are added to the PR
         header: "Hello @{name}, Thank you for updating!"
         footer: "To test for issues locally, `pip install flake8` and then run `flake8 nibabel`."
     no_errors: "Cheers! There are no style issues detected in this Pull Request. :beers: "