tidyquant 1.0.6

• Fix tq_performance test failure under PerformanceAnalytics 2.0.6 #223
• Fix failed r-devel test identified by CRAN
• Remove deprecated spread_() function
• Move readxl to imports. #222

tidyquant 1.0.5

• FIX: FB to META name change
• IMPROVEMENT: sp_index() to convert symbols from "BRK.B" to "BRK-B" to work with Yahoo Finance