leetcode changed anagrams to group-anagrams

Author: sangheestyle

Diff for: C++/anagrams.cpp renamed to C++/group-anagrams.cpp

@@ -305,7 +305,7 @@ I'll keep updating for full summary and better solutions. Stay tuned for updates
 3| [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [C++](./C++/longest-substring-without-repeating-characters.cpp) [Python](./Python/longest-substring-without-repeating-characters.py) | _O(n)_ | _O(1)_ | Medium ||
 30| [Substring with Concatenation of All Words](https://leetcode.com/problems/substring-with-concatenation-of-all-words/) | [C++](./C++/substring-with-concatenation-of-all-words.cpp) [Python](./Python/substring-with-concatenation-of-all-words.py) | _O((m + n) * k)_ | _O(n * k)_ | Hard          ||
 36| [Valid Sudoku](https://leetcode.com/problems/valid-sudoku/) | [C++](./C++/valid-sudoku.cpp) [Python](./Python/valid-sudoku.py) | _O(9^2)_         | _O(9)_          | Easy           ||
-49| [Group Anagrams](https://leetcode.com/problems/anagrams/)     | [C++](./C++/anagrams.cpp) [Python](./Python/anagrams.py)   | _O(n * glogg)_          | _O(n)_          | Medium         ||
+49| [Group Anagrams](https://leetcode.com/problems/group-anagrams/)     | [C++](./C++/group-anagrams.cpp) [Python](./Python/group-anagrams.py)   | _O(n * glogg)_          | _O(n)_          | Medium         ||
 76| [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/) | [C++](./C++/minimum-window-substring.cpp) [Python](./Python/minimum-window-substring.py) | _O(n)_ | _O(k)_ | Hard          ||
 149| [Max Points on a Line](https://leetcode.com/problems/max-points-on-a-line/) | [C++](./C++/max-points-on-a-line.cpp) [Python](./Python/max-points-on-a-line.py) | _O(n^2)_ | _O(n)_ | Hard          ||
 159| [Longest Substring with At Most Two Distinct Characters](https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/)| [C++](./C++/longest-substring-with-at-most-two-distinct-characters.cpp) [Python](./Python/longest-substring-with-at-most-two-distinct-characters.py) | _O(n)_ | _O(1)_ | Hard         |📖|