add lowercase requirements

CONTRIBUTING.md

@@ -26,8 +26,9 @@ Some things to keep in mind when making a pull request:
     - `docs`: A change only to in-code or markdown documentation.
     - `test`: A change that adds missing tests.
     - `chore`: A change that is likely none of the above.
-  - Be present tense (ie: "Fix", not "Fixed").
-  - Start with a verb (ie: "Fix ....", "Add ...", "Implement ...").
+  - Be in all lowercase.
+  - Be present tense (ie: "fix", not "fixed").
+  - Start with a verb (ie: "add ...", "implement ...", "update ...").
   - Have an emoji at the end of it (we like color around here). 🔥
 - Each PR should be attached to an issue, so be sure to add this to the PR
   description: