success 0.1.1

• Added a NEWS.md file to track changes to the package.
• Fixed lower CGR_CUSUM to calculate correct values
• Changed the way in which upper and lower BK- and CGR-CUSUMs are visualised.
  • Both charts now recalculate the highest and lowest value at failure times, aiding interpretation of the charts, but increasing computation time 2 fold for CGR-CUSUMs
• Reduced computation time of CGR-CUSUM approximately 4 fold (depends on size of data) using Rfast package.
  • Future: Rfast binary_search() is not optimal for this problem. Either write an adjusted binary_search fitting for the problem manually or look for other implementations.
• Created a hexagon for the package (can be found in /hexagon)
• Added data set based on real cancer trial.