v1.0.2

Fix crash when converting size string to UInt64 (#1)

For some tar files, `sizeString` returns a string with a whitespace at the end. 
`UInt64(sizeString, radix: 8)` would then return `nil`, and unwrapping the optional with `!` would lead to a crash.

Unlike the `UInt64` constructor, `strtoull` properly handles the string with whitespace at the end.

Another option would be to trim the whitespaces at the end of `sizeString` but it seemed safer
to avoid manipulating that string.