Outdated README

[jay-ui]

Some parts of the README file seems to be outdated. The part describing "Class: ObjectiveFcn" lists the following functions that are no longer present in "objective_functions.py".
MINIMIZE_TORQUE
MINIMIZE_TORQUE_DERIVATIVE
MINIMIZE_ALL_CONTROLS
MINIMIZE_MARKERS_DISPLACEMENT
MINIMIZE_MUSCLES_CONTROL
MINIMIZE_STATE_DERIVATIVE
TRACK_ALL_CONTROLS
TRACK_RIGID_CONTACT_FORCES
TRACK_MUSCLES_CONTROL
TRACK_TORQUE

Additionally, the following functions have the opposite problem where they aren't listed in README but are present in "objective_functions.py".
MINIMIZE_CONTROL
MINIMIZE_FATIGUE
MINIMIZE_POWER
MINIMIZE_QDDOT
MINIMIZE_SEGMENT_ROTATION
MINIMIZE_SEGMENT_VELOCITY
MINIMIZE_ALGEBRAIC_STATES
STOCHASTIC_MINIMIZE_EXPECTED_FEEDBACK_EFFORTS
TRACK_EXPLICIT_RIGID_CONTACT_FORCES
TRACK_SUM_REACTION_FORCES
TRACK_CENTER_OF_PRESSURE
TRACK_SUM_REACTION_FORCES
TRACK_CONTROL
TRACK_POWER
I only focused on this section but there might be other parts of the README file that need an update.

[EveCharbie]

@jay-ui, yes the readme is quite outdated on some topics. Are you saying you will open a PR to update the objective_function section of the readme?

[jay-ui]

I only had in mind to point out that this part was outdated but I didn't consider opening a PR to update it myself.
If I were to do so, I'd only be able to copy/paste the description of each function given in objective_functions.py since I'm not completely familiar with the library yet.

[EveCharbie]

Ok thanks. We'll see what we can do :)