upgrade phpunit library

no longer supports php 7.0

fixed broken tests, and added docker file for php 7.3

Merge pull request yooper#51 from ace411/patch-1

Add textconsole bin script to package configuration

Merge pull request yooper#49 from Euak/ngrams-fix

Get Ngrams frequencies fix

Merge pull request yooper#47 from Euak/ngrams

Ngrams improvements

Merge pull request yooper#46 from Euak/concod-mark

Improved concordance method

Merge pull request yooper#45 from thiagogomesverissimo/improving-conc…

…ordance

Improving concordance method

make some of vader sentiment class fields public

bug fixes