Fix EBML Lacer/Unlacer

[at-wat]

#84 (comment)

[codecov]

Codecov Report

Merging #140 (24f9e00) into master (210ec35) will decrease coverage by 0.28%.
The diff coverage is 97.22%.

@@            Coverage Diff             @@
##           master     #140      +/-   ##
==========================================
- Coverage   99.32%   99.04%   -0.29%     
==========================================
  Files          22       22              
  Lines        1193     1259      +66     
==========================================
+ Hits         1185     1247      +62     
- Misses          4        6       +2     
- Partials        4        6       +2     

Impacted Files	Coverage Δ
lacer.go	93.84% <75.00%> (-2.71%)	⬇️
block.go	100.00% <100.00%> (ø)
elementtable.go	100.00% <100.00%> (ø)
unlacer.go	97.67% <100.00%> (-2.33%)	⬇️
unmarshal.go	98.72% <100.00%> (ø)
value.go	100.00% <100.00%> (ø)

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[at-wat]

Example data from: https://matroska.org/technical/basics.html#ebml-lacing