Fix the migration datatype of an id column

[ghostwriter]

If applied, this pull request will:

• change the dataType of an id column from increments to bigIncrements ensuring relationships created with unsignedBigInteger (UNSIGNED BIGINT equivalent column) matches the dataType of an id column (Auto-incrementing UNSIGNED BIGINT ).
• update all the current test fixtures

Column Types	Description
increments	Auto-incrementing UNSIGNED INTEGER (primary key) equivalent column.
bigIncrements	Auto-incrementing UNSIGNED BIGINT (primary key) equivalent column.
unsignedBigInteger	UNSIGNED BIGINT equivalent column.

[jasonmccreary]

Nice. Can't believe this wasn't noticed earlier.

Ultimately I want to use the new id shorthand built-in to Laravel. But I'm going to support 5.8 a bit longer.

[msonowal]

@nathane @jasonmccreary ,
But now there is no option to have a column name id with normal increments as it always takes bigIncrements which is a issue

[jasonmccreary]

@msonowal, not sure your goal, but you can create a column named id as an increments column explicity.

For example:

models:
    User:
        id: increments

If that doesn't work, please open an issue.

[msonowal]

@jasonmccreary it does not work that is why at first I have created the issue and opened a PR #107