update Makefile

Signed-off-by: Grant Linville <grant@acorn.io>

Author: g-linville

Makefile

@@ -6,6 +6,7 @@ test:
 	cd tests && GPTSCRIPT_TOOL_REMAP="github.com/obot-platform/tools=.." go test -v tool_test.go
 	cd github-auth-provider && go test ./... && cd ..
 	cd google-auth-provider && go test ./... && cd ..
+	cd credential-stores && go test ./... && cd ..
 
 package-tools:
 	./scripts/package-tools.sh