updating DIRECTORY.md

Author: cclauss

DIRECTORY.md

@@ -117,6 +117,7 @@
   * [Not Gate](boolean_algebra/not_gate.py)
   * [Or Gate](boolean_algebra/or_gate.py)
   * [Quine Mc Cluskey](boolean_algebra/quine_mc_cluskey.py)
+  * [Sr Latch](boolean_algebra/sr_latch.py)
   * [Xnor Gate](boolean_algebra/xnor_gate.py)
   * [Xor Gate](boolean_algebra/xor_gate.py)
 
@@ -425,6 +426,7 @@
   * [Climbing Stairs](dynamic_programming/climbing_stairs.py)
   * [Combination Sum Iv](dynamic_programming/combination_sum_iv.py)
   * [Edit Distance](dynamic_programming/edit_distance.py)
+  * [Egg Dropping](dynamic_programming/egg_dropping.py)
   * [Factorial](dynamic_programming/factorial.py)
   * [Fast Fibonacci](dynamic_programming/fast_fibonacci.py)
   * [Fibonacci](dynamic_programming/fibonacci.py)
@@ -591,6 +593,7 @@
   * [Graphs Floyd Warshall](graphs/graphs_floyd_warshall.py)
   * [Greedy Best First](graphs/greedy_best_first.py)
   * [Greedy Min Vertex Cover](graphs/greedy_min_vertex_cover.py)
+  * [Hopcroft Karp](graphs/hopcroft_karp.py)
   * [Johnson](graphs/johnson.py)
   * [Kahns Algorithm Long](graphs/kahns_algorithm_long.py)
   * [Kahns Algorithm Topo](graphs/kahns_algorithm_topo.py)