automated tests for optional 1 04 hashes
added tests for 04 hash symbols optional 2 combine anagrams
Merge branch 'master' of github.com:lewagon/fullstack-challenges

Conflicts:
	01-Ruby/04-Hash-Symbols/Optional-01-Roman-to-integer/lib/roman_to_integer.rb
	01-Ruby/04-Hash-Symbols/Optional-02-Combine-anagrams/lib/group_anagrams.rb