Updated Makefile to build protos when running make build

Change-Id: I28a50cf1c30dde0a5897ced624296c2b99173668
diff --git a/Makefile b/Makefile
index 681b61f..a70d52b 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@
 # Generic targets
 protos: python-protos go-protos
 
-build: python-build go-build
+build: protos python-build go-build
 
 test: python-test go-test