Replaced grep commit by grep with regex including git sha hash

myDailyStats() used grep commit to detect count of commits. This
also increases the count by mentioning commit in the commit
message.

Therefore a grep with regex is used that expects a 40 digit/char
SHA1 hash after the word commit.

git-quick-stats

@@ -546,7 +546,7 @@ function myDailyStats() {
                        --author="$(git config user.name)" $_merges \
                        --since=$(date "+%Y-%m-%dT00:00:00") \
                        --until=$(date "+%Y-%m-%dT23:59:59") --reverse $_log_options \
-                       | grep commit | wc -l) "commits"
+                       | grep -E "commit [a-f0-9]{40}" | wc -l) "commits"
 }
 
 ################################################################################