add building the hvl library to the test cases
diff --git a/.travisCI/Makefile b/.travisCI/Makefile
index 5d0140a..d6bb932 100644
--- a/.travisCI/Makefile
+++ b/.travisCI/Makefile
@@ -49,6 +49,7 @@
 		git submodule update --init libraries/sky130_fd_sc_hdll/latest && \
 		git submodule update --init libraries/sky130_fd_sc_ms/latest && \
 		git submodule update --init libraries/sky130_fd_sc_ls/latest && \
+		git submodule update --init libraries/sky130_fd_sc_hvl/latest && \
 		$(MAKE) -j$(THREADS) timing
 
 .PHONY: build-pdk