Added update command

Change-Id: I67760f3dee2b85868aa3c318e172e7d4c7cd2d49
diff --git a/Makefile b/Makefile
index 7fb0073..75b86b1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,9 @@
 clean:
 	go clean -testcache && rm -r ./bin
 
+update:
+	go get -u ./... && go mod tidy
+
 buildfoma:
 	cd src && \
 	foma -e "source de/tokenizer.xfst" \