Merge pull request #58 from NeoBlack/master

[TASK] Allow symfony/console version 5

copies textconsole into bin directory

php 7.1 and below are not supported. updated phpunit library

upgrade phpunit library

no longer supports php 7.0

fixed broken tests, and added docker file for php 7.3

Merge pull request #51 from ace411/patch-1

Add textconsole bin script to package configuration

Merge pull request #49 from Euak/ngrams-fix

Get Ngrams frequencies fix

Merge pull request #47 from Euak/ngrams

Ngrams improvements

Merge pull request #46 from Euak/concod-mark

Improved concordance method