lts/lts-release-mail.txt: Fix punctuation, use colon before the list

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ia6d67b62e576a1d2f43b681411bcf443c3657a02
diff --git a/lts/lts-release-mail.txt b/lts/lts-release-mail.txt
index 31f6ae3..347cc76 100644
--- a/lts/lts-release-mail.txt
+++ b/lts/lts-release-mail.txt
@@ -4,7 +4,7 @@
 
 Hello,
 
-Trusted Firmware-A LTS version {version} is now available. This release contains the following patches.
+Trusted Firmware-A LTS version {version} is now available. This release contains the following patches:
 
 {commits}