Show more help text after generating a migration.

[jwage]

Q	A
Type	feature
BC Break	no
Fixed issues	#173

Summary

Improve the developer experience by showing more help text after generating a new migration.

cc @weaverryan

Output

$ ./migrations migrations:generate
Generated new migration class to "/data/doctrine/migration-test/lib/Doctrine/Test/Migrations/Version20180512034732.php"

To run just this migration for testing purposes, you can use migrations:execute --up 20180512034732

To revert the migration you can use migrations:execute --down 20180512034732

[localheinz]

Instead of multiple consecutive calls to writeln(), and instead of prefixing messages with "\n", what do you think about passing an array of message strings (and empty strings for new lines) to writeln() instead?

[jwage]

Changed.

[localheinz]

👍