Sort gradle modules alphabetically.

exercises/settings.gradle

 include 'largest-series-product'
 include 'linked-list'
 include 'luhn'
-include 'minesweeper'
+include 'matrix'
 include 'meetup'
+include 'minesweeper'
 include 'nth-prime'
 include 'nucleotide-count'
 include 'octal'
 include 'pascals-triangle'
 include 'phone-number'
 include 'pig-latin'
+include 'prime-factors'
+include 'pythagorean-triplet'
 include 'queen-attack'
 include 'raindrops'
 include 'rectangles'
 include 'robot-name'
 include 'robot-simulator'
 include 'roman-numerals'
-include 'prime-factors'
-include 'pythagorean-triplet'
 include 'scrabble-score'
 include 'series'
 include 'sieve'
 include 'simple-cipher'
 include 'simple-linked-list'
-include 'sublist'
-include 'sum-of-multiples'
 include 'space-age'
 include 'strain'
+include 'sublist'
+include 'sum-of-multiples'
 include 'triangle'
 include 'trinary'
+include 'twelve-days'
 include 'word-count'
 include 'wordy'
-include 'twelve-days'
-include 'matrix'