Parsing the encode result is broken in CLI

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When attempting to save the result from the `endcode` flag, the outputted result is not the same as the outputted result from the GeoJSON node script. There is an issue with the parser of the input or output.

Steps to reproduce:

1) polyline.json file includes:

`[[-114.05130386352539,51.112359778280194],[-114.05130386352539,51.11947193091105],[-114.05611038208008,51.12324308281078][-114.06538009643555,51.126152046793365], [-114.0736198425293,51.12916855668462]]`

2) using : `cat polyline.json | ./bin/polyline.bin.js --encode > encoded-poly.txt`:

result in `encoded-poly.txt`:

`"??????????_}hQ?????_qo]?~flW?_seK?~|hQ?_}hQ?_qo]?~reK?~|hQ?_seK?~|hQ?_}hQ?~reK?_{rc@?????~flW???????_ibE?_ibE?_seK?_glW?~reK???_ibE?~zrc@?_{rc@?~nyo@?_ibE?_oyo@?~po]?????????????????????????????????????_}hQ?????_qo]?~flW?_seK?~|hQ?_}hQ?_qo]?~reK?~|hQ?_seK?~|hQ?_}hQ?~reK?_{rc@?????~flW???????_oyo@?~po]?_}hQ?~zrc@?_oyo@?~zrc@?~|hQ?_y|u@?~nyo@???~hbE?_qo]?????????????????????????????????????_}hQ?????_qo]?_ibE?~po]???~hbE?_}hQ?_qo]?~zrc@?~reK?_oyo@?~nyo@???_oyo@?????~flW?????_ibE?_ibE?~hbE?_seK?~hbE?~|hQ?_oyo@?~zrc@?_{rc@?~dvi@?~hbE?_evi@?_ibE?????????????????????????????????????_}hQ?????_{rc@?~hbE?~reK?_qo]?~nyo@???_y|u@?~|hQ?~reK?~hbE?_seK?????????~flW?????_ibE?_glW?~po]?_glW?~|hQ?~reK?_glW?_seK?_ibE?_seK?~zrc@???_}hQ?~hbE?????????????????????????????????????_}hQ?????_evi@?~flW?_}hQ?~po]?_oyo@?~hbE?~flW?~reK?_}hQ?~|hQ?_evi@?~zrc@?????~flW?????_ibE?_evi@?~nyo@?_qo]?_seK?~|hQ???_ibE???_seK?~flW?_seK?~flW???????"`

Compare to the result from the GeoJSON node script:
> const polyline = require('@mapbox/polyline')
> undefined
> polyline.fromGeoJSON({ "type": "Feature",
... "geometry": {
..... "type": "LineString",
..... "coordinates": [[-114.05130386352539,51.112359778280194], [-114.05130386352539,51.11947193091105],[-114.05611038208008,51.12324308281078], [-114.06538009643555,51.126152046793365],[-114.0736198425293,51.12916855668462] ]
..... },
... "properties": {}
... });
'g{}vHrsbwTmk@?qV`]eQ|x@{Qnr@'`

Start with bin/polyline.bin.js and reproduce the issue using the supplied polyline.json input and --encode command. Compare its output with the shown GeoJSON node-script result, then trace the CLI input or output parser. Done means the CLI produces the expected encoded polyline for this input and the behavior is covered by a regression test.

Written by the indexing model from the issue text.