updating DIRECTORY.md

Author: cclauss

DIRECTORY.md

@@ -543,13 +543,13 @@
 
 ## [Geometry](geometry)
   * [Geometry](geometry/geometry.py)
-  * [Shoelace](geometry/shoelace.py)
   * [Graham Scan](geometry/graham_scan.py)
   * [Jarvis March](geometry/jarvis_march.py)
   * [Monotone Chain](geometry/monotone_chain.py)
   * [Ramer Douglas Peucker](geometry/ramer_douglas_peucker.py)
   * [Rotating Calipers](geometry/rotating_calipers.py)
   * [Segment Intersection](geometry/segment_intersection.py)
+  * [Shoelace](geometry/shoelace.py)
   * Tests
     * [Test Graham Scan](geometry/tests/test_graham_scan.py)
     * [Test Jarvis March](geometry/tests/test_jarvis_march.py)
@@ -818,6 +818,7 @@
   * [Monte Carlo](maths/monte_carlo.py)
   * [Monte Carlo Dice](maths/monte_carlo_dice.py)
   * [Ncr Combinations](maths/ncr_combinations.py)
+  * [Next Prime Number](maths/next_prime_number.py)
   * [Number Of Digits](maths/number_of_digits.py)
   * Numerical Analysis
     * [Adams Bashforth](maths/numerical_analysis/adams_bashforth.py)