Improved the makefile to create better release notes

Makefile

@@ -4,6 +4,7 @@
 DATE=`date +'%F'`
 NAME=`xmllint --xpath "//project/artifactId/text()" pom.xml`
 VERSION=`xmllint --xpath "//project/version/text()" pom.xml`
+PREVIOUS_TAG=`git tag | sort -r | head -n 1`
 
 clean:
 	@echo "[$(NAME)] Cleaning"
@@ -21,7 +22,7 @@ release-notes:
 	@echo "[$(NAME)] Writing release notes to src/docs/releases/release-$(VERSION).txt"
 	@echo "$(VERSION)" > src/docs/releases/release-$(VERSION).txt
 	@echo "" >> src/docs/releases/release-$(VERSION).txt
-	@git log --pretty="%ci %an %s" master >> src/docs/releases/release-$(VERSION).txt
+	@git log --pretty="%s" $(PREVIOUS_TAG)... master >> src/docs/releases/release-$(VERSION).txt
 
 deploy: build
 	@echo "[$(NAME)] Tagging and pushing to github"