Allow passing name

src/lucky_migrator/runner.cr

@@ -3,6 +3,8 @@ require "pg"
 require "colorize"
 
 class LuckyMigrator::Runner
+  MIGRATIONS_TABLE_NAME = "migrations"
+
   extend LuckyCli::TextHelpers
 
   @@migrations = [] of LuckyMigrator::Migration::V1.class
@@ -152,7 +154,7 @@ class LuckyMigrator::Runner
 
   private def create_table_for_tracking_migrations
     <<-SQL
-    CREATE TABLE IF NOT EXISTS migrations (
+    CREATE TABLE IF NOT EXISTS #{MIGRATIONS_TABLE_NAME} (
       id serial PRIMARY KEY,
       version bigint NOT NULL
     )

src/lucky_migrator/tasks/gen/migration.cr

@@ -59,12 +59,12 @@ end
 class Gen::Migration < LuckyCli::Task
   banner "Generate a new migration"
 
-  def call
+  def call(name : String? = nil)
     LuckyMigrator.run do
-      if ARGV.first? == nil
-        raise "Migration name is required. Example: lucky gen.migration CreateUsers".colorize(:red).to_s
+      if ARGV.first? || name
+        LuckyMigrator::MigrationGenerator.new(name: name).generate
       else
-        LuckyMigrator::MigrationGenerator.new(name: ARGV.first).generate
+        raise "Migration name is required. Example: lucky gen.migration CreateUsers".colorize(:red).to_s
       end
     end
   end