Omit merge commits from release changelog

Author: jmikola

Makefile.frag

@@ -147,7 +147,7 @@ package.xml: RELEASE
 RELEASE:
 	@echo "RELEASE $(MONGODB_VERSION)" >> RELEASE-$(MONGODB_VERSION)
 	@echo "-------------" >> RELEASE-$(MONGODB_VERSION)
-	@git log --pretty=format:"%ad  %an  <%ae>%n%x09* %s%n" --date short --since="$$(git show -s --format=%ad `git rev-list --tags --max-count=1`)" >> RELEASE-$(MONGODB_VERSION)
+	@git log --pretty=format:"%ad  %an  <%ae>%n%x09* %s%n" --no-merges --date short --since="$$(git show -s --format=%ad `git rev-list --tags --max-count=1`)" >> RELEASE-$(MONGODB_VERSION)
 	@echo -e "\n" >> RELEASE-$(MONGODB_VERSION)
 
 ChangeLog: