fix PR branch name error in build

Makefile

@@ -67,7 +67,7 @@ assets/classDiagram.svg: assets/classDiagram
 
 README.md: templates/README.md dist/lips.js .$(VERSION)
 	$(GIT) branch | grep '* devel' > /dev/null && $(SED) -e "s/{{VER}}/DEV/g" -e \
-	"s/{{VER_DASH}}/$(VERSION_DASH)/g" -e "s/{{BRANCH}}/$(BRANCH)/g" -e "s/{{CHECKSUM}}/$(TESTS_CHECKSUM)/g" \
+	"s/{{VER_DASH}}/$(VERSION_DASH)/g" -e "s#{{BRANCH}}#$(BRANCH)#g" -e "s/{{CHECKSUM}}/$(TESTS_CHECKSUM)/g" \
 	-e "s/{{YEAR}}/${YEAR}/g"  -e "s/{{DATE}}/${DATE_SHORT}/" -e "s/{{COMMIT}}/$(COMMIT)/g" \
 	< templates/README.md > README.md || \
 	$(SED) -e "s/{{VER}}/$(VERSION)/g" -e "s/{{BRANCH}}/$(BRANCH)/g" -e "s/{{YEAR}}/${YEAR}/g" \