Syncing up to Adhan v1.4.0

Changes include:

• Adding Shafaq enum
• Adding Rounding enum; allows for customization on how the final prayer times are rounded using, Nearest, Up, or None variants
• Adding Maghrib angle to the Parameter struct
• Adding a proptery called rounding to the Parameter struct to use the Rounding enum
• Adding a property called shafaq to the Parameter struct, using the Shafaq enum
• Replaced nearest_minute method with rounded_minute; This method takes a parameter of type Rounding
• Updating method signature of season_adjusted_evening_twilight(latitude:day:year:sunset:shafaq:) with the the Shafaq enum
• Adding doc comments
• Using the rounding method for Singapore Method
• Adding Turkey to the Method enum
• Adding Tehran to the Method enum; this method uses the newly added maghrib_angle property of the Parameter struct.
• Adding recomended method; based on the latitude of the provided location a variant of the HighLatitudeRule is returned
• Adding and updating tests
• Code formatting
• Updating copyright
• Documenting changes in the readme.md file