function returns incorrect range

[sanfx]

the function is returning range is not correct, the if the file size is 100331 the last range tuple is 100330!

https://github.com/galeo/pyflit/blob/master/pyflit/flit.py#L420

[galeo]

Hi, @sanfx
You may want to reference the W3C HTTP/1.1: Header Field Definitions about Byte Ranges:

Byte range specifications in HTTP apply to the sequence of bytes in the entity-body (not necessarily the same as the message-body).

A byte range operation MAY specify a single range of bytes, or a set of ranges within a single entity.

   ranges-specifier = byte-ranges-specifier
   byte-ranges-specifier = bytes-unit "=" byte-range-set
   byte-range-set  = 1#( byte-range-spec | suffix-byte-range-spec )
   byte-range-spec = first-byte-pos "-" [last-byte-pos]
   first-byte-pos  = 1*DIGIT
   last-byte-pos   = 1*DIGIT

The first-byte-pos value in a byte-range-spec gives the byte-offset of the first byte in a range. The last-byte-pos value gives the byte-offset of the last byte in the range; that is, the byte positions specified are inclusive. Byte offsets start at zero.
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