Error for upcoming deprecation -> error for contracts that may throw

[thewilsonator]

See dlang/dmd#16801

src/dfmt/globmatch_editorconfig.d(14,6): Error: `dfmt.globmatch_editorconfig.globMatchEditorConfig!(CaseSensitive.yes, wchar, ByCodeUnitImpl).globMatchEditorConfig`: `in` contract may throw but function is marked as `nothrow`
src/dfmt/globmatch_editorconfig.d(40,40): Error: template instance `dfmt.globmatch_editorconfig.globMatchEditorConfig!(CaseSensitive.yes, wchar, ByCodeUnitImpl)` error instantiating
src/dfmt/globmatch_editorconfig.d(187,33):        instantiated from here: `globMatchEditorConfig!(CaseSensitive.yes, wchar, wstring)`
src/dfmt/globmatch_editorconfig.d(14,6): Error: `dfmt.globmatch_editorconfig.globMatchEditorConfig!(CaseSensitive.yes, wchar, wstring).globMatchEditorConfig`: `in` contract may throw but function is marked as `nothrow`

code :

bool globMatchEditorConfig(CaseSensitive cs = CaseSensitive.osDefault, C, Range)(
        Range path, const(C)[] pattern) @safe pure nothrow
        if (isForwardRange!Range && isSomeChar!(ElementEncodingType!Range)
            && isSomeChar!C && is(Unqual!C == Unqual!(ElementEncodingType!Range)))
in
{
    // Verify that pattern[] is valid
    import std.algorithm : balancedParens;

    assert(balancedParens(pattern, '[', ']', 0));
    assert(balancedParens(pattern, '{', '}', 0));
}