Capitalize bullet points in CONTRIBUTING guide

English grammar dictates that these bullet points should be capitalized.
This also makes the capitalization style consistent with the rest of the
document, e.g. the "Decision Making Process" section.

test/functional/README.md

@@ -90,7 +90,7 @@ on nodes 2 and up.
 
 - Implement a (generator) function called `get_tests()` which yields `TestInstance`s.
 Each `TestInstance` consists of:
-  - a list of `[object, outcome, hash]` entries
+  - A list of `[object, outcome, hash]` entries
     * `object` is a `CBlock`, `CTransaction`, or
     `CBlockHeader`.  `CBlock`'s and `CTransaction`'s are tested for
     acceptance.  `CBlockHeader`s can be used so that the test runner can deliver