Merge pull request #6 from Panamus/master

Updated documentation to remove filename ambiguity

README.md

@@ -28,8 +28,11 @@ You need to have access to run WP CLI on the server. Typically `wp dbi migrate`
 By default, the command will look for migration files in `/app/migrations` directory alongside the vendor folder. This can be altered with the filter `dbi_wp_migrations_path`.
 Other paths can be added using the `dbi_wp_migrations_paths` filter. 
 
+Migration file names should follow the `yyyy_mm_dd_classname` format, eg. 2020_04_09_AddCustomTable.php
+
 An example migration to create a table would look like:
 
+**2020_04_09_AddCustomTable.php**
 ```
 <?php
 
@@ -84,4 +87,4 @@ class AddPricingPage extends AbstractMigration {
 
 You can run specific migrations using the filename as an argument, eg. `wp dbi migrate AddCustomTable`.
 
-To rollback all migrations you can run `wp dbi migrate --rollback`, or just a specific migration `wp dbi migrate AddCustomTable --rollback`.
+To rollback all migrations you can run `wp dbi migrate --rollback`, or just a specific migration `wp dbi migrate AddCustomTable --rollback`.