Update readme.md
Update readme.md

Copy edited (e.g. ref. <https://en.wikipedia.org/wiki/Visual_Studio_Code>, <http://en.wikipedia.org/wiki/Perl>, <http://en.wikipedia.org/wiki/Operating_system>, <http://en.wikipedia.org/wiki/OS_X>, <http://en.wikipedia.org/wiki/Strawberry_Perl>, <http://en.wikipedia.org/wiki/Microsoft_Windows>, <http://en.wikipedia.org/wiki/Application_programming_interface>, <http://en.wikipedia.org/wiki/GitHub>, and <https://en.wiktionary.org/wiki/appreciated#Verb>).
raix/vscode-perl-debug,raix/vscode-perl-debug,raix/vscode-perl-debug