Fix formatting of module info to avoid space right before semicolons …

[BjornJaspers]

…(Fixes #550)

What changed with this PR:

Fix for #550

Example

// Input
open module org.myorg.module {
    requires some.required.module;

    exports  org.myorg.module.exportpackage ;
    opens  org.myorg.module.openpackage ;
}

// Prettier 1.6.2
open module org.myorg.module {
    requires some.required.module;

    exports org.myorg.module.exportpackage ;
    opens org.myorg.module.openpackage ;
}

// Output
open module org.myorg.module {
    requires some.required.module;

    exports org.myorg.module.exportpackage;
    opens org.myorg.module.openpackage;
}

Relative issues or prs:

#550

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[clementdessoude]

Thank you for your contribution @BjornJaspers !