Given two consecutive numbers in a sequence, return TRUE if the
relative change is positive but less than the given tolerance.
1  | has_converged(current, previous, tol = 0.01)
 | 
current | 
 A scalar; the most recent value of the sequence.  | 
previous | 
 A scalar; the second most recent value of the sequence, or a reference value.  | 
tol | 
 The tolerance, a positive scalar near zero.  | 
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