Add helper function for money flow index
Add helper function for money flow index

desimonk/Lean,jameschch/Lean,florentchandelier/Lean,andrewhart098/Lean,squideyes/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,AnshulYADAV007/Lean,dalebrubaker/Lean,exhau/Lean,AlexCatarino/Lean,bdilber/Lean,young-zhang/Lean,kaffeebrauer/Lean,bizcad/LeanJJN,AnshulYADAV007/Lean,bdilber/Lean,FrancisGauthier/Lean,jameschch/Lean,Phoenix1271/Lean,rchien/Lean,Neoracle/Lean,Neoracle/Lean,bizcad/LeanJJN,redmeros/Lean,florentchandelier/Lean,bizcad/LeanJJN,Neoracle/Lean,mabeale/Lean,Obawoba/Lean,Jay-Jay-D/LeanSTP,JKarathiya/Lean,kaffeebrauer/Lean,tomhunter-gh/Lean,AnObfuscator/Lean,young-zhang/Lean,wowgeeker/Lean,tzaavi/Lean,StefanoRaggi/Lean,jameschch/Lean,iamkingmaker/Lean,QuantConnect/Lean,kaffeebrauer/Lean,bizcad/LeanAbhi,jameschch/Lean,mabeale/Lean,bizcad/LeanITrend,mabeale/Lean,Phoenix1271/Lean,FrancisGauthier/Lean,StefanoRaggi/Lean,bizcad/Lean,bdilber/Lean,iamkingmaker/Lean,rchien/Lean,Jay-Jay-D/LeanSTP,bizcad/LeanJJN,bizcad/LeanITrend,Jay-Jay-D/LeanSTP,exhau/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,andrewhart098/Lean,squideyes/Lean,Phoenix1271/Lean,devalkeralia/Lean,AnObfuscator/Lean,Jay-Jay-D/LeanSTP,dalebrubaker/Lean,AnObfuscator/Lean,AnshulYADAV007/Lean,rchien/Lean,desimonk/Lean,tomhunter-gh/Lean,squideyes/Lean,exhau/Lean,a-hart/Lean,bdilber/Lean,racksen/Lean,FrancisGauthier/Lean,dpavlenkov/Lean,bizcad/LeanAbhi,florentchandelier/Lean,JKarathiya/Lean,StefanoRaggi/Lean,bizcad/LeanAbhi,redmeros/Lean,Mendelone/forex_trading,devalkeralia/Lean,QuantConnect/Lean,redmeros/Lean,dpavlenkov/Lean,Neoracle/Lean,bizcad/LeanAbhi,bizcad/Lean,a-hart/Lean,tzaavi/Lean,JKarathiya/Lean,dpavlenkov/Lean,tzaavi/Lean,FrancisGauthier/Lean,Obawoba/Lean,JKarathiya/Lean,andrewhart098/Lean,young-zhang/Lean,devalkeralia/Lean,wowgeeker/Lean,racksen/Lean,squideyes/Lean,rchien/Lean,redmeros/Lean,QuantConnect/Lean,Mendelone/forex_trading,iamkingmaker/Lean,iamkingmaker/Lean,bizcad/Lean,Mendelone/forex_trading,exhau/Lean,wowgeeker/Lean,desimonk/Lean,wowgeeker/Lean,racksen/Lean,AnshulYADAV007/Lean,racksen/Lean,bizcad/LeanITrend,young-zhang/Lean,tomhunter-gh/Lean,dalebrubaker/Lean,kaffeebrauer/Lean,desimonk/Lean,Jay-Jay-D/LeanSTP,tzaavi/Lean,AlexCatarino/Lean,mabeale/Lean,AlexCatarino/Lean,Phoenix1271/Lean,bizcad/Lean,devalkeralia/Lean,dpavlenkov/Lean,florentchandelier/Lean,jameschch/Lean,bizcad/LeanITrend,AnshulYADAV007/Lean,andrewhart098/Lean,AnObfuscator/Lean,tomhunter-gh/Lean,Mendelone/forex_trading,Obawoba/Lean,Obawoba/Lean,dalebrubaker/Lean,QuantConnect/Lean