linter: Update commit title regex to match uppercase for the first le…

…tter.

.gitlint

@@ -4,7 +4,7 @@ ignore=title-trailing-punctuation, body-min-length, body-is-missing
 # extra-path=tools/lib/gitlint-rules.py
 
 [title-match-regex]
-regex=^.+\.$
+regex=^(.+:\ )?[A-Z].+\.$
 
 [title-max-length]
 line-length=76