Merge pull request buildpacks-community#1241 from pivotal/bump-e2e-timeout

bump e2e test timeout to 30 min

Author: Daniel Chen

Makefile

@@ -10,6 +10,6 @@ unit-ci:
 	$(GOCMD) test ./pkg/... -coverprofile=coverage.txt -covermode=atomic
 
 e2e:
-	$(GOCMD) test --timeout=15m -v ./test/...
+	$(GOCMD) test --timeout=30m -v ./test/...
 
 .PHONY: unit unit-ci e2e