Merge pull request #8 from mkreyman/65851754_about_symbols_master

about symbols master

[Delivers #65851754]
Just helping out...
Fixed about_hashes.rb to pass all tests

Learned about:
- creating hashes,
- hash literals,
- various ways to access and modify values in hashes,
- testing hash keys,
- combining hashes,
- default values when creating a new hash,
- that a block can be passed as a default value for new hash.

[#65851750]
Fixed line 75, 76