Detect previous FreshRSS installation
Detect previous FreshRSS installation

See https://github.com/FreshRSS/FreshRSS/issues/909

aledeg/FreshRSS,asmundg/FreshRSS,Alkarex/FreshRSS,marienfressinaud/FreshRSS,samuelstein/FreshRSS,marienfressinaud/FreshRSS,Dolomich/FreshRSS,romibi/FreshRSS,aledeg/FreshRSS,superboum/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,asmundg/FreshRSS,aledeg/FreshRSS,marienfressinaud/FreshRSS,samuelstein/FreshRSS,romibi/FreshRSS,FreshRSS/FreshRSS,Dolomich/FreshRSS,romibi/FreshRSS,Alkarex/FreshRSS,samuelstein/FreshRSS,FreshRSS/FreshRSS,asmundg/FreshRSS,superboum/FreshRSS,Dolomich/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,superboum/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS