fix migration incompatibility

database/migrations/2018_09_07_101031_create_bookings_table.php

@@ -25,8 +25,9 @@ class CreateBookingsTable extends Migration
             // The name of the person or company which the booking belongs to
             $table->string('person_or_company');
 
-            // An additional note to the booking
-            $table->string('note')->nullable();
+            // An additional note to the booking. The real dataset contains
+            // notes longer than the 191-character default string length.
+            $table->text('note')->nullable();
 
             $table->timestamps();
         });