commitpkg: clearly delineate the commit message template and the rationale

In commit 75d23eec94 we moved to include
commitpkg arguments as the first line of the svn commit message, but we
simply dumped the result after the version number without separating the
two, increasing the cognitive burden of parsing the rationale. Since the
whole point of the change was to make it easier to see what happened
when using git log --oneline (reducing the cognitive burden of parsing
'pretty' output with author/date info), it makes sense to also delineate
the reason correctly.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>

commitpkg.in

@@ -112,7 +112,7 @@ if [[ -n $(svn status -q) ]]; then
 	msgtemplate="upgpkg: $pkgbase $(get_full_version)"
 	if [[ -n $1 ]]; then
 		stat_busy 'Committing changes to trunk'
-		svn commit -q -m "${msgtemplate} ${1}" || die
+		svn commit -q -m "${msgtemplate}: ${1}" || die
 		stat_done
 	else
 		msgfile="$(mktemp)"