bug: Index will go out of range when RANGE > 2

[HarikrishnanBalagopal]

Bug

There is a index out of range bug here:

github-release-notes/lib/src/Gren.js

Lines 1096 to 1101 in 8c5affc

	for (let i = 0; i < sortedReleaseDates.length - 1; i++) {
	const until = sortedReleaseDates[i + 1].date;
	ranges.push([
	sortedReleaseDates[i],
	{
	...sortedReleaseDates[i + RANGE - 1],

The for loop index goes all the way to length - 2 (2nd last element) and we are accessing indices i and i + 1 in the loop.
This only works when RANGE = 2.

When RANGE > 2 we will access indices i and i + RANGE - 1 which will end up outside the range of the array
because we are not changing the for loop end condition.
Example:

RANGE = 3
length = 4
for loop i goes to length - 2 = 4 - 2 = 2
i = 2
i + RANGE - 1 = i + 3 - 1 = i + 2 = 2 + 2 = 4
...sortedReleaseDates[4], // gives a index out of range exception 

Fix

        for (let i = 0; i < sortedReleaseDates.length - RANGE + 1; i++) {