minor #3 Improve the readability of the Makefile tasks (javiereguiluz)

This PR was merged into the master branch.

Discussion
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Improve the readability of the Makefile tasks

In case https://github.com/fabpot/flex/issues/29 is accepted, this should be the solution.

Commits
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6785a02 Improve the readability of the Makefile tasks

symfony/framework-bundle/3.3/manifest.json

@@ -20,9 +20,11 @@
         "cache-clear:",
         "\t@test -f bin/console && bin/console cache:clear --no-warmup || rm -rf var/cache/*",
         ".PHONY: cache-clear",
+        "",
         "cache-warmup: cache-clear",
         "\t@test -f bin/console && bin/console cache:warmup || echo \"cannot warmup the cache (needs symfony/console)\"",
         ".PHONY: cache-warmup",
+        "",
         "serve:",
         "\t@echo \"\\033[32;49mServer listening on http://127.0.0.1:8000\\033[39m\"",
         "\t@echo \"Quit the server with CTRL-C.\"",