Add a reference to LICENSE file to README
Add a reference to LICENSE file to README

pytest-dev/pytest,tomviner/pytest,eli-b/pytest,lukas-bednar/pytest,ropez/pytest,malinoff/pytest,hpk42/pytest,Bachmann1234/pytest,rmfitzpatrick/pytest,nicoddemus/pytest,markshao/pytest,tgoodlet/pytest,Bachmann1234/pytest,hackebrot/pytest,etataurov/pytest,flub/pytest,ddboline/pytest,JonathonSonesen/pytest,davidszotten/pytest,txomon/pytest,userzimmermann/pytest,skylarjhdownes/pytest,jaraco/pytest,lukas-bednar/pytest,RonnyPfannschmidt/pytest,hpk42/pytest,Akasurde/pytest,alfredodeza/pytest,vmalloc/dessert,vodik/pytest,nicoddemus/pytest,omarkohl/pytest,vodik/pytest,pfctdayelise/pytest,MichaelAquilina/pytest,MengJueM/pytest,ropez/pytest,userzimmermann/pytest,omarkohl/pytest,The-Compiler/pytest,tomviner/pytest,MengJueM/pytest,JonathonSonesen/pytest,The-Compiler/pytest,tareqalayan/pytest