Updates in version 1.1.0
======================

Major changes
- Function 'heatmapFromPoints' has been renamed to 'heatmapFromTrajectory'. 
- Function 'getTrajectory' now returns a trajectory object instead of a list to simplify downstream processing.
- Several functions that previously accepted a parameter of type dataframe now require an object of class 'trajectory'. This affects all functions that operate on trajectory data.

New features
- Added function 'centroid', 'isClosed', 'normalVectors', 'reverseTrajectory', 'smoothTrajectory', 'subsampleTrajectory', 'tangentVectors', 'trajectory', 'trimTrajectory'
Minor updates
- Added input validation to several functions.

Minor updates in version 1.0.1
======================

- Updated the default parameter of the 'videoToFrames' function
- Modified the return format of the 'getTrajectory' function
- Updated the default parameter of the 'readImage' function
- Added an instruction message to the 'getRadius' function